Question

the inner circumference of a circular race track is 264 and the width of the track is 7 metre calculate the cost of putting up a fence along the outer circle of the track @ Rupees 15 per metre​

Answer 1

Answer:

Inner circumference=2.πr=264

2x22/7xr=264

r =264x7/2x22 =42

inner radius-42

outer radius R=49

outer circumference=2πR

2x22/7. x 49=308m

cost of fencing=308x15= Rs4620

Answer 2

The cost of putting up a fence along the outer circle of the track @ Rupees 15 per metre​ is Rs.4620

Step-by-step explanation:

Circumference of circle =$2 \pi r$

We are given that the inner circumference of a circular race track is 264 m

So, $2 \pi r = 264$

$2 \times \frac{22}{7} \times r = 264$

$r=\frac{264 \times 7}{2 \times 22}$

r=42 m

We are given that the width of the track is 7 meter

So, Outer radius R = 42+7=49 m

Circumference of outer circle = $2 \pi R = 2 \times \frac{22}{7} \times 49 =308 m$

Cost of fencing outer circle 1 m = rs.15

Cost of fencing outer circle 308 m = $15 \times 308=Rs.4620$

Hence the cost of putting up a fence along the outer circle of the track @ Rupees 15 per metre​ is Rs.4620

#Learn more:

The inner circumference of circular track is 220 M the track is 7 M wide everywhere calculate the cost of putting up of fence along the outer circle @ rupees 2 per metre​

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