Question

length of a rectangle is twice the breadth, if it s perimeter is 60cm find the length​

Answer 1

Answer:

20 cm.

Step-by-step explanation:

Let the breath = x

So length = 2x

Perimeter of rectangle = 2(l+b)

60 = 2(2x + x )

60 = 2 × 3x

60 = 6x

x = 60/6

x = 10

Hence, length is 2x = 20 cm.

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Answer 2

Given :-

$\sf\bullet { Perimeter\:=\:60cm}$

To find :-

$\sf\bullet {Length}$

Formula used !

$\bigstar{\boxed{\sf{Perimeter\:=\:2(L+B)}}}$

Solution :-

$\bf{Let \:Breadth\: of\: rectangle\:=\:x\:cm}$

$\bf{So,\:Length\:of\: rectangle\:=\:2x\:cm}$

A . T . Q

$\tt{Perimeter\:=\:2(L+B)}$

$\tt{60\:=\:2(x+2x)}$

$\tt{ \cancel{60}\: = \:\cancel{2} (3x)}$

$\tt{ 30\:=\:3x}$

$\tt{ \cancel{30}\:=\: \cancel{3}x}$

$\tt{x\:=\:10}$

$\tt\boxed{Length(2x)\:=\:20cm}$