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(180 - 50) / 2
=130 / 2
= 65
Cara cari nilai X
65 = sudut A
65 = 2x + 13
65-13 = 2x
52 = 2x
x = 52/2
x = 26
cara cari nilai Y
65 = sudut B
65 = x + 3y
65 = 26 + 3y
65-26 = 3y
39 = 3y
y = 39/3
y = 13
Semoga membantu :)