Question

The diameter of a circular Park is 24 m. A 3m wide path runs around it from inside. Find the cost of paving the path at ₹25 per squre meter.

Answer 1

The diameter of circle is 24m. Therefore radius is 12mNow, the a 3m wide circular whose radius and circumference lies inside the big circle is 12m-3m=9mSo, now we know the radius of the big and small circle.So the area of big circle= 22÷7×12*2=452.54The area of small circle=22÷7×9*2=254.57Therefore area of path. =452.54-254.57=197.97
Therefore the total cost. = 197.97×25=4949.25