Question

Pada segitiga ABC, besar sudut A=1/2 sudut C, dan sudut B= 1 1/2 sudut A. hitunglah besar sudut-sudut segitiga ABC tersebut!

Answer 1

A = 1/2 C
B = 1 1/2 A
   = 3/2 x 1/2 C
   = 3/4 C
A+B+C = 180°
1/2 C + 3/4 C + C = 180°
2/4 C + 3/4 C + 4/4 C = 180°
9/4 C = 180°
9C = 720°
C = 80°

mk A = 1/2 x 80°  = 40°
B = 3/4 x 80 = 60°