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b = 3y
1/2 × (a + b) × t = L
1/2 × (y + 3y) × 5 = 60
1/2 × 4y × 5 = 60
4y = 60 : 5 × 2
4y = 12 × 2
4y = 24
y = 6
a = y
= 6 cm
b = 3y
= 3(6)
= 18 cm
Jadi panjang kedua sisi sejajarnya adalah 6 cm dan 18 cm.