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(5x+10)° = (4x+30)°
(5x+10-10)°= (4x+30-10)°
5x° = (4x+20)°
5x°- 4x° = (4x-4x+20)°
1x° = 20°
Jadi, x° adalah 20°
b.) <BAD= 360°- (<ABC+<ADC+<BCD)
= 360°- [(5x+10)°+(4x+30)°+60°]
= 360°- (110°+110°+60°)
= 360°- 280°
= 80°
Jadi, besar <BAD adalah 80°