Question

the perimeter of a rectangle is 42cm and it's length is double it's breadth. find it's length and breadth.​

Answer 1

✠ Given :-

• Perimeter of rectangle = 42 cm
• Length of rectangle is double of it's breadth

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✠ To Find :-

• Length and breadth of the rectangle

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✠ Solution :-

Let :

• Breadth of rectangle = x
• Length of rectangle = 2x

★ Perimeter of rectangle = 2 ( L + B )

→ 42 = 2 ( 2x + x )

→ 42/2 = 3x

→ 21 = 3x

→ x = 21/3

→ x = 7

Therefore :

• Breadth of rectangle = 7 cm
• Length of rectangle = 14 cm

Answer 2

$\large\sf\green{Required Answer}$

Given:

Perimeter: 42 cm

Let Breadth be = x

Length = 2x (as it's double the breadth)

Solⁿ:

Formula : peri. = 2(l+b)

$42 = 2(2x + x) \\ \\ 42 = 4x + 2x \\ \\ 42 = 6x \\ \\ \frac{\cancel{42}}{\cancel{6}} = x \\ \\ { \boxed{\purple{7 = x}}}$

So,

Breadth = 7 cm

Length = 2x => 2×7 = 14 cm

Hope it helps

Mark brainliest pls :)