Question

how to find the length of a rectangle if the perimeter is 30 and the breadth is 5 cm​

Answer 1

Answer:

$perimeter = 30 cm\\ \\ \\ b = 5cm \\ \\ \\ perimeter \: of \: rectangle = 2(l + b) \\ \\ \\ 30 = 2(l + 5) \\ \\ \\ \frac{30}{2} = l + 5 \\ \\ \\ 15 = l + 5 \\ \\ \\ l = 15 - 5 \\ \\ \\ l = 10cm$

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