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The sides of a rectangle are in the 4:5. Find its sides if the perimeter is 90cm.

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Let the breadth and length of rectangle be `4x` and `5x` respectively.
Perimeter of rectangle
=`2xx`(length + breadth)
=`2(4x+5x)=90`
`9x`=`45`
`x`=`45/9`=`5`
So,Length=`5x` =`5xx5`=`25 cm`
Breadth =`4x` = `4xx5` = `20cm`
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