Question

7. Find the breadth of the rectangle whose perimeter is 20 cm and length is 4 cm.
please give me answer with solution​​

Answer 1

Answer:

$p=2(l+b)\\\\b=\frac{1}{2} p-l$

$b = \frac{1*20}{2} - 4\\\\b= 10 - 4\\breadth = 4cm$

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Answer 2

Using the perimeter formula
P= 2(l+b)
20= 2(4+b)
20= 8+2b
20-8 = 2b
12 = 2b
12/2 = b
6 =b