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Pelurus = (180-x)°
Penyiku = (90-x)°
Maka:
Pelurus = 4 x Penyiku
(180-x)° = 4(90-x)°
180° - x = 360° - 4x
-x + 4x = 360° - 180°
3x = 180°
x = 60°
Maka,
Sudut yang dimaksud adalah 60°
besar sudut penyiku = 90 derajat
180 × 2 = 360 derajat
90 × 4 = 360 derajat