in triangle ABC DE//BC if AD = 4cm AB = 7 cm DE = 3 cm FIND BC
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In ΔABC and ΔADE
∠BAC = ∠DAE
∠ABC = ∠ADE
∴ ΔABC ~ ΔADE
∴AB/AD= BC/DE
7/4 = BC/3
21/4 = BC
5.25
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