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5x+5+3x+15 = 180°
8x+20 = 180°
8x = 180°-20°
8x = 160°
x = 160°/8
x = 20°
b)
sudut A2
= 5x+5
= 5.20°+5
= 100°+5
= 105°
c)
sudut B5
= 3x+15
= 3.20°+15
= 60°+15
= 75°
d)
sudut B7
= sudut B5
= 75°