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2y - 15 = 57 - y
2y + y = 57 + 15
3y = 72
y = 72 / 3 = 24
Jadi, Besar Sudut K
= ( 2y - 15 )°
= ( 2 ( 24 ) - 15 )°
= ( 48 - 15 )°
= 33°