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Lp = 648 cm²
t = 15 cm
Lp = 2xLuas alas + Keliling x tinggi
648 = 2xd₁xd₂/2 + 4x10x15
648 = 3/4 d₂ x d₂ + 600
3/4 d₂² = 648-600
3/4 d₂² = 48
d₂² = 48 x 4/3
d₂² = 64
d₂ = √64
d₂ = 8 cm
d₁ = 3/4 d₂ = 3/4 x 8 = 6 cm