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< K + < L + < M = 180°
2y + 15° + 3y + 25° + y + 20° = 180°
6y + 60° = 180°
6y = 120°
y = 20°
< K = 2.20° + 15° = 55°
< L = 3.20° + 25° = 85°
< M = 20° + 20° = 40°
Semoga membantu ya :)
K = 2y + 15°
L = 3y + 25°
M = y + 20°
ΔKLM = 180°
sudut K + sudut L + sudut M = 180°
2y + 15° + 3y + 25° + y + 20° = 180°
6y + 60° = 180°
6y = 180°- 60°
6y = 120°
y = 120° / 6
jadi y = 20°
Subtitusi y ke K L M
Sudut K = 2y + 15°
= 2(20°) + 15°
= 40° + 15°
= 55°
Sudut L = 85°
Sudut M = 40°