D and E are two points respectively on sides AB and AC of triangle ABC such that DE is parallel to BC. If the ratio of area of triangle ADE to that of the trapezium DECB is 144:25 and DE=13 cm, then find the length of BC.
Pick
A) 5  B) 13  C) 14  D) 11  E) 15
ABC and ADE are similar triangles.   So (side of 5BC/side of 5DE)^2=25/169   side of 5BC/side of 5DE = 5/13   So the length of BC = 5   5nswer - 5
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D and E are two points respectively on sides AB and AC of triangle ABC such that DE is parallel to BC. If the ratio of area of triangle ADE to that of the trapezium DECB is 144:25 and DE=13 cm, then find the length of BC.