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L. Ade = L. bce = 1/2xaxt = 1/2 x 2x7 = 7 cm^2
L. Abef = L. abcd - 2(L.Ade)
= 70- 2(7) = 56 cm2
atau pake rumus trapesium
L. abef = 1/2 x (sisi sejajar) x t
= 1/2 (10+6) x 7 = 56cm2