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Prove that of all parallelograms of w...

Prove that of all parallelograms of which the sides are given, the parallelogram which is rectangle has the greatest area.

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Let us consider all parallelogram of sides a and b.

In ||gm ABCD of sides a and b, let h be the height corresponding to the base a.
Then, `hleb`.
Now, `hleb rArr ah le ab. `
`therefore ar("||gm ABCD")lear("rect.ABCD").`
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