Question

VE
Shashank's class has two notice boards. One is a square of side 155 cm and
the other is a rectangle of length 110 cm and breadth 72 cm. What are the
perimeters of the two boards? Which board will cover more area?
One day Shashank got late while leaving the classroom and in his hurry to catch
the school bus, his school bag accidentally hit the notice board and its glass
door broke. Next day, he made confession and apologised to his class teacher
and offered to replace the glass door. What quality of Shashank is evident in
this incident?​

Answer 1

Answer:

Question 1.

How much wire will be needed to make a rectangle 7 cm long and 4 cm wide?

Solution:

Perimeter of a rectangle

= 2 x length + 2 x breadth

= 2 x 7 + 2 x 4

= 14 + 8

= 22 cm

∴ 22 cm wire will be needed to make a rectangle

Maharashtra Board Class 5 Maths Solutions Chapter 12 Perimeter and Area Problem Set 49

Question 2.

If the length of a rectangle is 20 m and its width is 12m, what is its perimeter?

Solution:

Perimeter of a rectangle

= 2 x length + 2 x breadth

= 2×20 + 2×12

= 40 + 24

= 64 m

∴ Perimeter is 64 m

Question 3.

Each side of a square is 9 m long. Find its perimeter.

Solution:

Perimeter of a square

= 4 x length of one side

= 4 x 9

= 36 m

∴ Perimeter is 36 m

Question 4.

If we take 4 rounds around a field that is 160 m long and 90 m wide, what is the distance we walk in kilometres?

Solution:

Perimeter of a rectangular field

= 2 x length + 2 x breadth

= 2 x 160 + 2 x 90

= 320 + 180

= 500 m

In one round distance walked is 500 m, hence, distance walked in 4 rounds

= 500 x 4

= 2000 m

= 2km

∴ The distance walked in 4 rounds is 2 km