KUNCI JAWABAN matematika kelas 8 Ayo Kita Berlatih 6.2 Halaman 22 23 24

Kunci jawaban buku siswa kelas 8 smp mts sAyo Kita Berlatih 6.2 Halaman 22  23 24 bab 6 Semester 2 kurikulum 2013 edisi revisi 2017 soal dan jawaban buku mtk kelas 2 smp mts semester 1 dan semester 2 

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KUNCI JAWABAN matematika kelas 8 Ayo Kita Berlatih 6.2 Halaman 22  23 24 bab 6 Semester 2

KUNCI JAWABAN Ayo Kita Berlatih 6.2 bab 6 matematika kelas 8  smp mts 

1. Tentukan jarak antara dua titik dari pasangan titik berikut.
a. (10, 20), (13, 16) 
b. (15, 37), (42, 73) 
c. (−19, −16), (−2, 14)

a. (10 , 20)  dan (13 , 16)

Jarak a = 

            = 

            = 

            = 

            = √25

            = 5 

b. (15 , 37) dan (42 , 73)

Jarak b = 

           = 

           = 

           = 

           = √2025

           = 45 

c. (-19 , -16) dan (-2 , 14)

Jarak c = 

           = 

           = 

           = 

           = 

           = √1189

           = 34,48 

2. Diketahui ∆ABC dengan titik-titik A(−1, 5), B(−1, 1), dan C(2, 1). Apakah segitiga ABC merupakan segitiga siku-siku? Jelaskan

 Iya. Segitiga ABC adalah segitiga siku-siku karena panjang ketiga sisi segitiga memenuhi teorema Pythagoras,A (-1 , 5), B (-1 , 1), dan C (2 , 1).

Panjang AB = 

                   = 

                   = 

                   = √16

                   = 4 satuan

Panjang BC = 

                   = 

                   = √9

                   = 3 satuan

Panjang AC = 

                   = 

                   = 

                   = √25

                   = 5 satuan

Pembuktian

AB² + BC² = AC²

    4² + 3² = 5²

    16 + 9 = 25

          25 = 25

Jadi Δ ABC merupakan segitiga siku-siku, karena ketiga sisinya merupakan tripel pythagoras.

3. Tentukan luas daerah yang diarsir dari setiap gambar berikut.

3. Tentukan luas daerah yang diarsir dari setiap gambar berikut.

a)
jari-jari = 1/2 x √(202 – 162
= 1/2 x √(400 – 256)
= 1/2 x √144
= 1/2 x  12
= 6 cm
Luas daerah arsir = 1/2 x luas lingkaran
= 1/2 x π x r x r
= 1/2 x 3,14 x 6 x 6
= 56,52 cm2
Jadi, luas daerah yang diarsir pada gambar a adalah 56,52 cm2.

b)

DC = √(202 – 122)
= √(400 – 144)
= √256
= 16 cm
Luas daerah diarsir = luas ABC + luas ACD
= (1/2 x 15 x 20) + (1/2 x 16 x 12)
= 150 + 96
= 246 cm2
Jadi, luas daerah yang diarsir pada gambar b adalah 246 cm2.

4. Guru meminta kalian untuk menentukan jarak antara dua titik (4, 2) dan (7, 6). Kamu menggunakan (4, 2) sebagai (x1 , y1 ) sedangkan temanmu menggunakan (7, 6) sebagai (x1 , y1 ). Apakah kamu dan temanmu memperoleh hasil yang sama? Jelaskan.

Hasilnya SAMA, alasannya adalah bilangan negatif bila dikuadratkan hasilnya akan selalu positif, sehingga meskipun bilangan x1, y1 dengan x2, y2 diubah urutannya maka hasilnya akan tetap sama.

5. Ahmad dan Udin berdiri saling membelakangi untuk main tembaktembakan pistol bambu.

 Ahmad berjalan 20 langkah ke depan kemudian 15 langkah ke kanan. Pada saat yang sama, Udin berjalan 16 langkah ke depan kemudian 12 langkah ke kanan. Udin berhenti kemudian menembak Ahmad. 
a. Gambar situasi di atas dengan menggunakan bidang Kartesius. 
b. Berapa langkah jarak mereka berdua saat Udin menembak Ahmad dengan pistol bambu?
A)

b)
Jarak = √((12+15)2 + (16 + 20)2)
= √(272 + 362)
= √(729 + 1.296)
= √2025
= 45 langkah
Jadi, jarak mereka berdua adalah 45 langkah

6. Seorang atlet tenis mengajukan pertanyaan kepada wasit. Suara atlet mampu didengar wasit hanya pada jarak maksimum 30 kaki.

KUNCI JAWABAN matematika kelas 8 Ayo Kita Berlatih 6.2 Halaman 22  23 24

Jawaban :
Jarak = √(242 – (12 – 5)2)
= √(242 + (12 – 5)2)
= √(576 + 49)
= √625
= 25 kaki
Jadi, wasit dapat mendengar suara atlet karena jarak mereka berdua hanya 25 kaki dan jarak dengar maksimum wasit adalah 30 kaki.

7. Tinggi sebuah jendela lantai 2 pada sebuah gedung kira-kira 8 meter. Di depan gedung tersebut ada sebuah taman dengan lebar 6 m. Berapakah panjang tangga minimum yang dibutuhkan agar kaki-kaki tangga tidak merusak taman tersebut?

Jawaban :
Panjang Tangga = √(82 + 62)
= √(64 + 36)
= √100
= 10 meter
Jadi, panjang tangga minimum agar kaki tangga tidak merusak taman adalah  10 meter.

8. Seorang penyelam dari Tim SAR mengaitkan dirinya pada tali sepanjang 25 m untuk mencari sisa-sisa bangkai pesawat di dasar laut.

KUNCI JAWABAN matematika kelas 8 Ayo Kita Berlatih 6.2 Halaman 22  23 24

Jari-jari = √(252 – 202)
= √(625 – 400)
= √225
= 15 m
Luas daerah = π x r x r
= 3,14 x 15 x 15
= 706,5 m2
Jadi, luas daerah yang dapat dijangkau oleh penyelam tersebut adalah 706,5 m2.

9. Tentukan panjang AG dari bangun berikut

KUNCI JAWABAN matematika kelas 8 Ayo Kita Berlatih 6.2 Halaman 22  23 24

Jawaban :
a)
AE = 10
EG = √(HG2 + GF2)
= √(102 + 102)
= √(100 + 100)
= √200
AG = √(AE2 + EG2)
= √(102 + √2002)
= √(100 + 200)
= √300
= 10√3
Jadi, panjang AG adalah 10√3.
b)
HG = 5
AH = √(AD2 + DH2)
= √(52 + 102)
= √(25 + 100)
= √125
AG = √(HG2 + AH2)
= √(52 + √1252)
= √(25 + 125)
= √150
= 5√6
Jadi, panjang AG adalah 5√6.

10. Bola A dan bola B digantung pada suatu kawat lurus seperti pada gambar di samping. Diameter Bola A dan Bola B berturut-turut adalah 8 dan 18. 

KUNCI JAWABAN matematika kelas 8 Ayo Kita Berlatih 6.2 Halaman 22  23 24

Jawaban :
l = 10 satuan
BC = 9 satuan
AD = FE = 5 satuan
ED = FA = 4 satuan
AB = 4 + 9 = 13 satuan
BD = √(AB2 – AD2)
= √(132 – 52)
= √(169 – 25)
= √144
= 12 satuan
n = l + ED + (BD – BC)
= 10 + 4 + (12 – 9)
= 17 satuan
Jadi, panjang minimum tali n adalah 17 satuan.

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walks around the outside of the ring and they touch each each person on the head as they walk by and say duck duck duck and then randomly this one person will select on

e child and say goose you’re the goose and so if you are chosen as the goose you have to get up and chase the other person around the circle um and try to get back to your the place where you were sitti

ng down before them no you have to tag them right the the person who was going duck duck duck and then goose they try to run around the circle and steal your spot right and you if you’re fast enough yo

u can run around and if you tag them then they keep going and you get your spots too right right so it’s it’s it’s like a seated version of tag almost but i don’t know why we call it duck duck goose yeah no clue i don’t know okay so this one is actually i think it’s like from scotland or something i don’t kn

ow i forgot i looked it up but eenie meenie miney mo so usually when you’re trying to decide who let’s say you want to play hide and seek and you don’t know who’s going to be the one who’s it so then 

veKunci jawaban buku siswa kelas 8 smp mts sAyo Kita Berlatih 6.2 Halaman 22  23 24 bab 6 Semester 2 kurikulum 2013 edisi revisi 2017 soal dan jawaban buku mtk kelas 2 smp mts semester 1 dan semester 2 ry day okay you’re it and there’s a few variations of that um pretty much everyone knows that i s

till use it to this day honestly most people shorten it though because the tiger the whole tiger thing is quite long so i think eeny meeny miny mo it’s just a rhyme to choose someone i mean you could flip a Kunci jawaban buku siswa kelas 8 smp mts sAyo Kita Berlatih 6.2 Halaman 22  23 24 bab 6 Semester 2 kurikulum 2013 edisi revisi 2017 soal dan jawaban buku mtk kelas 2 smp mts semester 1 dan semester 2 coin or do like rock paper scissors or something like that but for whatever reason we do

this eeny meenie miney moe thing did you ever do nose goes uh as a child no as an adult for a drinking game yes you see this is the thing all the things that were like children’s games become adult drin

king games when you grow up slowly get perfect very very mature okay uh my last one is truth or dare um perhaps this is um more for like junior high school and high school age when you start getti

ngKunci jawaban buku siswa kelas 8 smp mts sAyo Kita Berlatih 6.2 Halaman 22  23 24 bab 6 Semester 2 kurikulum 2013 edisi revisi 2017 soal dan jawaban buku mtk kelas 2 smp mts semester 1 dan semester 2  a little bit more like curious is maybe the right word so the game is um you have there are two choices that you can make thismay

be you have similar games in your country so if you uh if you had some interesting experiences playing these games or if you have a game that’s similar um to one of the games or one of the um ideas that we’ve talked about here please let us know in a comment and it would be interesting to compare 

ny other ideas that’s about it that’s about it okay uh well thanks very much for joining us for this episode of english topics and we will see you again soon take care bye hi everybody my name is alicia 

ween experience in the united states so we’re going to share some things about our experience as children and perhaps as adults with halloween thus far so the first topic for discussion for today is our favo

rite costume so this is something that we’ve actually worn at any point in time for halloween so what for you what has been your favorite costume thus far so this was a tough one to think about because the fun costumes i’ve made um i had more fun making than wearing like i made like a mega man costu

me a mega a mega man jedi costume that was pretty cool but my favorite was the kissing booth oh so this was one of those easy you know you don’t make it you go to the store and you buy it and it just has like plastic pvc pipe in a square with a red curtain and like text that says kissing boots really easy

 my friend had it it was last minute i didn’t have a costume he said hey you should use this and it was a lot of fun but it was before you know i was still young so i wasn’t this like crazy passionate drunken it was you know i was like 15. so it’s just a peck but it was the first time to get kisses and stuff and it was just so that was my fun like funnest memory of wearing a costume okay okay yeah that’s a

 good one mine i went a different route with i picked a character actually i went one year as uh tom hanks from castaway um so i had like a uh just a ripped up white t-shirt and and some i just bought like a pair of old pants at the thrift store and ripped those up a bit and i made my hair really really big and kind of put some like fake bruising on my face and then i made a paper mache wilson the volley

ball that he had with him on the island i made like the hand print and everything on it and carried that around castaway was a famous um tom hanks film from oh gosh 10 or 15 years ago now i don’t even know when that movie came out but uh castaway tom hanks is stuck on an island by himself 

his only companion is a volleyball that has a bloody hand print on it and he names the ball and like well you’ll watch the movie um so yeah i chose to go as tom hanks character from that movie that year yeah that was that was like you say it was more fun to make the costume than it was to wear the costume almost how does one trick or treat by the way ah trick-or-treating is basically going door-to-door to your neighbors uh usually with your parents so that there’s no you know dangerous kind of possibilities you knock on the door and you say trick or treat and you know there’s five or six cute little kids and costumes and then whoever’s living there gives you candy and you have you know the the most com

mon thing is you just get a pillow case but they also have like you know they they want to sell um plastic jack-o’-lantern yeah which the jack-o’-lanterns like the pumpkin i think most people know that and it has a cut hole so it’s plastic you can buy those um or just yeah pillowcase and get it full of candy and you go to as many houses as you can trying to get as much candy as you can um and you know if you’re 

kind of uh mischievous or like whatever you’re greedy or you want to maximize your your your candy profit you plan beforehand with your friends and you go okay we’re going to skip that  game truth where your friends will ask you a question and you have to reply with the truth to that question so usually truth is like who’s the person that you like or do y

ou want a boyfriend or do you want a girlfriend usually it’s something like that if you don’t choose truth then you have to choose dare so dare is the choice where your friends get to tell you to do something and it’s usually something crazy um so you either have the option of being in other words humiliated by sharing something secret or humiliated by doing something embarrassing it’s a 

it’s a fun game of humiliation to play with your friends um i i’ve i have some i actually have some good memories playing this game nothing nothing like bad really just really really silly stuff actual

ly like singing weird songs in front of like my my friend’s parents that kind of thing right put underwear on your head or something yeah yeah yeah the one i remember that just came to mind is they tolKunci jawaban buku siswa kelas 8 smp mts sAyo Kita Berlatih 6.2 Halaman 22  23 24 bab 6 Semester 2 kurikulum 2013 edisi revisi 2017 soal dan jawaban buku mtk kelas 2 smp mts semester 1 dan semester 2 d me i was like okay dare and then they said to uh go outside act like a cow get on all fours and take a big mouthful of the grass and chew it so that was kind of that’s a creative dare yeah yeah that was like that’s why i still remember it because usually they’re just kind of like i dare you to like i don’t kno

w drink too much ketchup or something i don’t know just something kind of mm-hmm yeah i don’t know i was pretty good drink too much ketchup no maybe yeah i’ve never heard daddy i’m wearing too much ketchup is that’s too much ketchup i decided two tablespoons is adequate it’s like the an

nual sorry every every time all right uh i’m out i think maybe you’re out okay great so those are a few things that perhaps i think most if not all american kids know or are aware of a lot of them were games Kunci jawaban buku siswa kelas 8 smp mts sAyo Kita Berlatih 6.2 Halaman 22  23 24 bab 6 Semester 2 kurikulum 2013 edisi revisi 2017 soal dan jawaban buku mtk kelas 2 smp mts semester 1 dan semester 2 

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