di ketahui perpotongan tiga garis berikut nilai y= jawab yang bener ya!

∠AOB + ∠BOC + ∠COD = 180
2x - 6 + x + 15 + x - 9 = 180
4x = 180
x = 45

∠EOA + AOB = 180
3y - 12 + 2x - 6 = 180

x = 45, maka

3y - 12 + 90 - 6 = 180
3y + 72 = 180
3y = 108
y = 36 (b)