Question

21. What is the perimeter of the given
figure if all the measures are in cm?
3.8
7b
4.4
6.3
3.8
7.2
4.20
4.3
4.5+
8.2
1.7
3.5
(a) 68.2 cm
(b) 38.1 cm OL
uildi (c) 86.3 cm n....
(d) 68.3 cm​

Answer 1

Answer:

If PS = l and PQ = b

Perimeter of a Rectangle

2Save

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.

Perimeter of a rectangle = 2 (length + breadth)