1. In ΔABC, D and E are points on side AB and AC respectively. DE is parallel to BC. If lengths of AD, DB and DE are 8 cm, 6 cm and 7.2 cm respectively, find length of BC?
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By: anil on 05 May 2019 02.11 am
DE is parallel to BC => $$frac{AD}{AB} = frac{DE}{BC}$$ => $$frac{8}{8 + 6} = frac{7.2}{BC}$$ => $$frac{4}{7} = frac{7.2}{BC}$$ => $$BC = 1.8 imes 7 = 12.6$$ cm => Ans - (A)
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