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90-10=4x
80=4x
20=x
3x-5=3(20)-5=60-5=55
90° = (x+3x) + (15-5)°
90° = 4x°+ 10°
90°- 10° = 4x°+10°- 10°
80° = 4x°
80°/4 = 4x°/4
16° = x°
* Sudut SQR = (3x-5)°
= (3.16-5)°
= (48-5)°
= 43°
Jadi, Sudut SQR adalah 43°