pada gambar diatas sudut L =

K + L + M = 180°
40° + 2x + 3x = 180°
2x + 3x = 180° - 40°
5x = 140°
x = 28

Sudut L
=> 2x
=> 2 x 28
=> 56°

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40°+3x+2x=180°
40°+5x=180°
5x=180°-40°
5x=140°
x=140°:5
x=28°

sudut L= 2x = 2.28° = 56°