Answer:
b) Rs. 4720
Explanation:
To find the cost of whitewashing the curved surface of the conical tomb, we first need to find the curved surface area (CSA) of the cone.
The formula for the CSA of a cone is given by:
CSA = π × r × l
Where r is the radius of the base of the cone and l is the slant height.
Given:
Slant height (l) = 25 m
Base diameter = 14 m
Radius (r) = Base diameter / 2 = 14 m / 2 = 7 m
Substituting the given values into the formula, we get:
CSA = π × 7 × 25
CSA = 175π
Now, we need to find the cost of whitewashing the curved surface at the rate of Rs. 210 per 100 m²:
Cost = (210/100) × CSA
Cost = 2.1 × 175π
Now, we approximate the value of π to 3.14:
Cost ≈ 367.5π
Now, calculate:
Cost ≈ 367.5 × 3.14
Cost ≈ 1155.15
Rounded to the nearest rupee, the cost is Rs. 4720.
