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(2x + 30) + (5x + 10) = 180
7x + 40 = 180
7x = 180-40
7x = 140
x = 140/7
x = 20
Maka,
b = (5x+10)
b = 5(20) + 10
b = 100 + 10
b = 110 derajat
2x+30°+5x+10° = 180°
7x+40° = 180°
7x = 180°-40°
7x = 140°
x = 20°
b = 5x+10°
b = 5(20°)+10°
b = 100°+10°
b = 110°