Question

The diameter of a semicircular table is 10 cm. Find the cost of polishing the semicircular table top at ₹ 3.50 per sq.cm

Answer 1

₹ 137.46

Explanation:

Here, we want to find a cost

Firstly, we need the area of the semi circular table

The area is by the formula;

A = pi/2 * r^2

Since d = 10

r = d/2 = 10/2 = 5

A is thus;

3.142/2 * 5^2 = 39.275 sq. cm

Cost per sq cm is 3.50

cost of 39.275 sq. cm will be

39.275 * 3.50 = 137.4625