Question

given,breadth=5cm,length=x,perimeter=142cm
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Answer 1

Answer:

Perimeter of the rectangle = PQ + QR + RS + SP

= b +l + b + l

= 2b +2l

Again,

ABCD is a rectangle. We know that the opposite sides of a rectangle are equal.

Perimeter of a Rectangle

AB = CD = 5 cm and BC = AD = 3 cm

So, the perimeter of the rectangle ABCD = AB + BC + CD + AD = 5 cm + 3 cm + 5 cm + 3 cm = 16 cm

It can be written as 5 cm + 5 cm + 3 cm + 3 cm

= (2 × 5) cm + (2 × 3) cm

= 2 (5 + 3) cm

= 2 × 8 cm

= 16 cm

We add length and breadth twice to find the perimeter of a rectangle.

Answer 2

Answer:

63.5

Step-by-step explanation:

Perimeter = 2(l+b)

=142=2(5+x)

=142=15+2x

=2x+15=142

=2x=142-15

=2x=127

=x=127/2

=x=63.5

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