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2x + 3 + 3x - 8= 90
2x + 3x + 3 - 8= 90
5x - 5= 90
5x= 90 + 5
5x= 95
x= 95/5
x= 19
Sudut abc :
2x + 3
2(19) + 3
38 + 3
41°
Sudut cbd :
3x - 8
3(19) - 8
57 - 8
49°
Pelurus sudut cbd adalah :
180 - 49
131°
Jadi Jumlah sudut ABC dan CBD = 90°
2x + 3 + 3x - 8 = 90
5x - 5 = 90
5x = 90 + 5
5x = 95
x = 95 / 5 =19
Pelurus Sudut CBD = 180° - [ 3 (19) - 8]°
= 180 - ( 57 - 8 )°
= 180° - 49
= 131°