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L = d1 x d2/2
L = 18 × 2x + 3
81 = 9 × 2x + 3
2x + 3 = 81/9
2x + 3 = 9
2x = 9 - 3
2x = 6
x = 6/2
x = 3
d2 = 2(3) + 3 = 6 + 3 = 9cm
d₂ = (2x + 3) cm
L = 1/2 × d₁ × d₂
81 = 1/2 × 18 × (2x + 3)
81 = 9 × (2x + 3)
81 = 18x + 27
18x = 81 - 27
18x = 54
x = 3
d₂ = (2x + 3) cm
= (2(3) + 3) cm
= (6 + 3) cm
= 9 cm
Jawab ~> a) x = 3
b) d₂ = 9 cm