Question

Tolong jawab ya no 2 dan no 4 nya, penting banget pr buat besok dan saya masih belum ngerti materinya, terimakasih

Answer 1

2. sp/bc = pq/ab
 = sp/20 = 4/8
 = spx8 = 20 x 4
 = sp x 8 = 80
 = sp = 80/ 8
 = sp = 10
⇔keliling PQRS = 2p + 2l
 = 2 x 10 + 2 x 4
 = 20 + 8 = 28

Answer 2

2. 8/20 x 4/X

8x= 20x4
x=80/8 
x= 10

keliling = 10 + 4 x 2 = 28

4 . c/15 x  10 / 20

20c = 10x15 
c= 150/20 = 7,5
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a/10 x 18/7,5

7,5a=10 x 18
a=180/7,5 = 25

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b/15 x 16/20
20b = 15 x 16
b=240/20 = 12