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In the figure, set DH| side EF and seg G...

In the figure, set `DH_|_` side EF and seg `GK_|_` side EF. If `DH=12cm, GK=20` and `A(DeltaDEF)=300cm^(2)`.
Find (i) EF(ii) `A(DeltaGEF)` (iii) `A(squareDEGF)`.

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The correct Answer is:
(i) `EF=50cm` (ii) `A(DelataGEF)=500cm^(2)`
(iii) `A(squareDEGF)=800cm^(2)`.
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