In a triangle ABC, D and E are midpoints of AB and AC respectively. DE is parallel to BC. If AD=2, DB=3, AE=4 Find AC
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Since DE // BC ( given)
=> AD/DB = AE/ EC
=> 4/ 4.5 = 8/ EC
=> 4EC = 8 x 4.5
=> EC = 2 x 4.5 = 9
AC = AE + EC
=> AC = 8 + 9 = 17
=> AC = 17 cm
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