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2 : 3
2y : 3y
luas = (a+b) x t x 1/2
60 = (2y + 3y) 6 x 1/2
60 = 5y x 3
60 = 15y
60 : 15 = y
4 = y
sisi a = 2y = 2 x 4 = 8 cm
sisi b = 3y = 3 x 4 = 12 cm
a : b = 2x : 3x
L = 1/2 * (a + b) * t
60 cm^2 = 1/2 * (2x + 3x) * 6 cm
2(60 cm^2) = (1/2 * (2x + 3x) * 6 cm) 2
120 cm^2 = 5x * 6 cm
120 cm^2/6cm = (5x * 6 cm)/6 cm
20 cm = 5x
20 cm/5 = 5x/5
4 cm = x
x = 4 cm
a = 2x
a = 2(4 cm)
a = 8 cm
b = 3x
b = 3(4 cm)
b = 12 cm
Jadi, panjang sisi sejajarnya adalah 8 cm dan 12 cm