Question

Sudut A: sudut B = 1:2 . besar sudut C adalah??

Answer 1

Sudut A = sudut C
sudut C = 60

Answer 2

<A : <B = 1 : 2
<A = <C
<B = <D

<A + <B = 180
1y + 2y = 180
3y = 180
y = 60

maka 
<C = <A
<C = 1y = 1 x 60 = 60 derajat