Question

If the perimeter of a rectangle is 90 cm and its breadth is 20 cm

Answer 1

length be l
breadth be 20
perimeter of rectangle = 90 cm
2(l+b)= 90
2l+2b=90
2l+2(20)=90
2l+40=90
2l=90-40
2l=50
l=25cm

Answer 2

Find Its Length =

$perimeter = 90cm \\ breadth = 20cm \\ length = \\ 2(l + b) = 90\\ 2(l + 20) = 90 \\ l + 20 = \frac{90}{2} \\ l + 20 = 45 \\ l = 45 - 20 \\ l = 25$

Length = 25

Find its area =

$l \times b \\ 25 \times 20 \\ 500 {cm}^{2}$

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