Question

diameter of a circular path is 24m. a 3m wide path runs around it from inside. Find the costs of paving the path at ₹25 per square metre

Answer 1

R = 12 m and 3 m path runs inside it and therefore r = 9 m. Area of concentric circle = pi(R+r)(R-r) or pi(R² - r²).and substituting the values we get 198 m².and therefore the cost of paving = RS.4950