Question

2) What is the perimeter of following
rectangles?
(i) length = 25 cm and width = 18 cm
(ii) length = 38 cm and width = half of length
3) What is the length of the side of a square
if the perimeter is: (1) 36 cm (ii) 169 cm?
4) The perimeter of a rectangular map of
the world is 270 cm. It is 90 cm in height.
How wide is it?​

Answer 1

Answer:

2. (i) Length = 25cm

Width = 18cm

Perimeter = 2(length+breadth) unit

= 2(25+18) cm

= 2(43) cm

= 86 cm

(ii) Length = 38 cm

Width = Half of Length = 38/2 cm = 16 cm

Perimeter = 2(length+breadth) cm = 2(38+16) cm

= 2(54) cm = 108 cm

3. (i) Perimeter = 36 cm

(Side × 4) = Perimeter

or, Side = Perimeter/4 cm

or, Side = 36/4 cm

or, Side = 9 cm

(ii) Perimeter = 169 cm

(Side × 4) = Perimeter

or, Side = Perimeter/4 cm

or, Side = 169/4 cm

or, Side = 42.25 cm

4. Perimeter = 270 cm

Height = 90 cm

2(Length/Height + Breadth) = Perimeter

or, 2(90 + Breadth) = 270 cm

or, 180 + 2Breadth = 270 cm

or, 2Breadth = (270 - 180) cm

or, 2Breadth = 90 cm

or, Breadth = 90/2 cm

or, Breadth = 45 cm

Answered By Oishi Bag on 25.02.21