Question

the inner circumference of a circular track is 220 m and the width of the track is 7 m calculate the cost off putting fence along the outer circle of the track at the rate of of rupees 50​

Answer 1

Answer:

648cm2 ,3,2,400

this is correct answer

Answer 2

Answer:

The cost of fencing the outer circle is Rs.13200

Step-by-step explanation:

Given:

The inner circumference of the circular track = 220 m

 The width of the track = 7 m

To find out:

 The cost of fencing along the outer circle at the rate of 50 rupees.

Solution:

 To find the cost of fencing we have to find the circumference of the outer circle.

Let 'r' be the radius of the inner circle, then the radius of the outer circle will be 'r+7'.

The formula for the circumference (C) is given by,

      C = 2πr

  < $\pi=\dfrac{22}{7}$ >

In the case of the inner circle⇒

     220 = 2πr

        $r=\dfrac{220}{2\pi}$

       r = 35 m

In the case of the outer circle ⇒

     C = 2π(r + 7)

Substitute the value of 'r' to find the circumference,

    C = (2π)(35 + 7)

        = 2π(42)

        = 264 m

 Hence the cost of fencing = 264 × 50 = Rs.13200