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perbandingannya 2 : 3 : 4
jadi = 6 : 9 : 12 (kecil)
8 : 12 : 16 (besar)
3. 32
perbandingannya 3 : 5
besar = 9 dan 15
kecil = 6 dan 10
keliling = 10 + 10 + 6 + 6 = 32
ingat 2 bangun yg pasti sebangun itu , persegi , segitiga sama sisi, lingkaran , segi 5 beraturan , segi 6 beraturan
2) a/9 = 16/12
a = 9 x 16 / 12
a = 12
jawaban A
3) SP/9 = 10/15
SP = 9 x 10 / 15
= 6
keliling = 2(6+ 10) = 32
jawaban B
4) jawaban B
18/9 = 9/4,5
5) jawaban C
6/9 = 4/6 = 8/12
6) segitiga ABC , < A = 55 , < B = 80 , < C = (180 - 80 - 55) = 45
cari yg sudut"nya 55, 80 dan 45
jawaban C