Question

Pada segitiga ABC diketahui sudut A = 50°
Jika B dan C = 2: 3, tentukan besar sudut B dan sudut C

Answer 1

180 = 50 + 2x + 3x
180 = 50 + 5x
5x   = 130
x     = 26

B = 2x = 2(26) = 52
C = 3x = 3(26) = 78

Answer 2

B : C = 2 : 3
misal :
B = 2x
C = 3x

A + B + C = 180°
50° + 2x + 3x = 180°
5x = 180°-50°
5x = 130°
x = 26°

B = 2x = 2(26) = 52°
C = 3x = 3(26) = 78°

semoga membantu :)