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<Segitiga = <A + <B + <C
180 =30 + <B +<C
180 -30 = <B + <C
150 = <B +<C
B : C = 10cm : 20cm
B : C = 1: 2
150 = B +C
150 = 3
30 =1
<B= 1 . 30
= 30
<C = 2. 30
= 60
panjang A = 10 cm
= 5cm
maaf kalo salah :)