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Use of Algebraic Expressions in Formula of Perimeter of Figures

The perimeter...

Question

The perimeter of kite is $80 c m$ .If the length of one side is $20 c m$ , find the length of other side.

A

10 c m

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B

20 c m

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C

30 c m

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D

None

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Solution

The correct option is A $20 c m$
Perimeter of kite $= 2 (a + b)$
$2 (a + b) = 80$
$b = 20, a = ?$
$2 (a + 20) = 80, a + 20 = 40, a = 20$

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