Q. 44.0( 7 Votes )

# What is the cost of fencing a circular place of radius 7.7 m. with three rounds of wire, if the wire costs Rs 50 per m?

Answer :

We have

Given: Radius of the circular fence, r = 7.7 m

The wire is about the circular fence. So, we need to find the circumference of this circular fence in order to find the length of the wire used in 1 round of fence.

Circumference of circle is given by,

Circumference = 2πr

⇒ Circumference

⇒ Circumference

If the circumference of the circular fence = 48.4 m

Then, length of wire used in 1 round = 48.4 m

⇒ length of wire used in 3 rounds = 3 × 48.4

= 145.2 m

If the cost of 1 m of wire used = Rs. 50

Then, cost of 145.2 m of wire used = 50 × 145.2

= 7260

Thus, cost of fencing the circular place with 3 rounds of wire is Rs. 7260.

Rate this question :

A bus has wheels of diameter 0.7 m. How many times must a wheel of the bus rotate for covering the distance of 22 km between two towns?

MHB - Mathematics (Old)Find the circumference of the circles from their diameters given below.

(1) 3.5 cm

(2) 6.3 m

(3) 0.14 m

MHB - Mathematics (Old)Write the proper values in the blanks in the following table.

MHB - Mathematics (Old)