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caranya 3/8 × 360 = 135.
no 27 = c.
caranya 180 - 90 - 36 = 54.
no 28 = b.
caranya 8y-72 = 3y + 48
= 8y - 3y = 72 + 48
= 5y = 120
y = 24.
no 29 = d.
no 30 = a.
no 31 = a
caranya 180 - 130 - 35 = 15
no 32 = d.
caranya 180 = 2x + 3x + 5x
180/10 = x
18 = x
jadi besar sudut b = 3(18)
= 54
no 33 = b.
caranya 48 - ( 24 + 7)
48 - 31 = 17
no 34 = c.
caranya LΔ = 1/2 × a × t
= 1/2 × 12 × 4
= 6 × 4 = 24