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2x + 7 + 3x - 12 = 180°
5x = 180° - 7 + 12
5x = 185°
x = 185°/5
x = 37°
∠K = 2x + 7
= 2.37 + 7
= 74 + 7
= 81°
∠K = ∠L
Jadi, besar ∠L = 81° (C)
sudut N= sudut M
2(3x - 12) + 2(2x + 7) = 360°
6X - 24 + 4x + 14 = 360
10X = 360 +24 - 14
10X = 370
x = 37°
karna sudut L = sudut K
maka
2X + 7 =
2(37) +7 =
74 + 7 = 81°
jadi jawabannya c yaitu 81°