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12 cm, 16 cm, 20 cm
15 cm, 20 cm, 25 cm
Maka,
dc = 16 cm
Ab = 25 cm
Masuk ke rumus trapesium
L= 1/2 x a x t
L= 1/2 x 25 x 12
L = 25 x 6
L = 150 cm^2