Question

Q12: The perimeter of a rectangle is 140 CM if the breadth of the rectangle is 20 cm. Find its length also find the area of the rectangle.
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Answer 1

Answer:

We know Perimeter = 2 (length + breadth)

Perimeter = 140 cm

Breadth = 28 cm

Let length be x cm

140 = 2 ( x + 28)

140 = 2x + 56

2x + 56 = 140

2x = 140 - 56

2x = 84

x = 84/2

x = 42 cm

The length of the rectangle is 42 cm

Answer :The length of the rectangle is 42 cm...

Answer 2

Answer:

Q. The perimeter of a rectangle is 140 CM if the breadth of the rectangle is 20 cm. Find its length also find the area of the rectangle.

Solution:- Given,

Perimeter of a rectangle = 140 cm

Breadth = 20 cm

To find,

Length and Area of the rectangle

Let length be = X cm

we know,

Perimeter of = 2×( L+B )

a rectangle

140 = 2 × ( X + 28 )

140 = 2X + 56

140 - 56 = 2X

84 = 2X

84/2 = X

X = 42

Step-by-step explanation:

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