The length of a rectangle is 5 cm longer than its width

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The length of a rectangle is 
 longer than its width. 
If the perimeter of the rectangle is 
 , find its area.
Feb 13th, 2015

let the width of rectangle be "x"
so, length = x+5

perimeter is given by = 2(length + width) = 2(x+x+5) = 2(2x+5) = 4x+10
given perimeter = 42

so, 4x+10 =42
4x = 32

so, width = 8 cm
length = x+5 = 8+5 = 13 cm

so, area of rectangle = length* width = 8*13= 104 cm square

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Feb 13th, 2015

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