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10.) as triangles are similar so ratio of sides would be same. as given 2ab = de ,so every side of def is double of corresponding sides of abc. SO BY TRIANGLE FORMULA = √S(S-A)(S-B) ( S-C)
= √ 8 √s( s-a) (s-b) (s-c)
= 2√2.100
200√2
= √ 8 √s( s-a) (s-b) (s-c)
= 2√2.100
200√2
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