D and E are respectively the points on the sides AB and AC of a triangle ABC such that AE =5cm,AC=7.5cm,DE=4.2cm and DE is parallel to BC. the length of BC is equal to.
a) 6.3cm
b) 8.4cm
c) 2.1 cm
d) 10.5 cm
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abc and ade triangles are similar because its angles are same
6.3 = BC
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