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Question

ABC ~DEF.
If A(ABC):A(DEF)=16:25 and BC=2.2 cm, find EF.

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Solution

Since ABC ~DEF, A( ABC)A(DEF)=AB2DE2=BC2EF2=AC2DF2A( ABC)A(DEF)=BC2EF2On substituting A( ABC)A(DEF)=1625, BC=2.2 cm , we get:1625=(2.2)2EF2EF2=2516×2.22EF2=54×2.22On taking square root of both sides, we get: EF=54×2.2=2.75 cm

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