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Sudut : Pelurus = 2 : 3
Misalkan x sebagai variable pengganti, maka
Sudut : Pelurus = 2x : 3x
Sudut + Pelurus = 180°
2x + 3x = 180°
5x = 180°
x = 36°
Besar Sudut = 2x = 2 . 36° = 72°
Penyiku = 90° - 72° = 18° (A)
32.
Sudut CBQ + Sudut RQB = 180°
(4x - 4°) + (2x + 7°) = 180°
6x + 3° = 180°
6x = 177°
x = 29,5°
Sudut CBD = Sudut RQB
Sudut CBD
= 2x + 7°
= 2 . 29,5° + 7°
= 59° + 7°
= 66° (C)