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प्रश्न
Find the length of the diagonal of a square whose area is `128 cm^2` Also, find its perimeter.
उत्तर
Area of the square= `128 cm^2`
Area =` 1/2 d^2` (where d is a diagonal of the square)
⇒` 128=1/2 d^2`
⇒` d^2=256`
⇒`d=16 cm`
Now,
`Area= "Side^2"`
⇒` 128= "side"^2`
⇒`" Side"= 11.31 cm`
Perimeter= `4` (side)
=`4(11.31)`
=`45.24 cm`
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