Question

The perimeter of a rectangle is 20 cm,its breadth i 4cm what is its length?

Answer 1

perimeter = 20 cm
breadth = 4 cm
2(l+b) = 20 cm
2( l+4) = 20
(l+4)= 20/2
(l+4)= 10
l = 20-4 = 16 cm ans
hope it helps you

Answer 2

perimeter of rectangle = 2 (l+b)
20cm=2×l+4cm
20=2×l+4
20-4=2×l
16=2×l
16/2=l
16÷2=l
8=l
8=length
therefore; 2×l+b
2×8+4
16+4
20 = perimeter
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