# CBSE Class 10-Mathematics: Chapter – 12 Areas Related to Circles Part 21 (For CBSE, ICSE, IAS, NET, NRA 2022)

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**Question 18**:

A round table cover has six equal designs as shown in the figure. If the radius of the cover is , find the cost of making the design at the rate of per . (Use )

**Answer**:

Area of one design

Area of equilateral

[Area of equilateral triangle with side a ]

Total cost

**Question 19**:

Find the area of the shaded region where ABCD is a square of side .

**Answer**:

Area of square ABCD

Diameter of each circle

Radius of each circle

Area of one circle

Area of the four circles

**Question 20**:

ABCD is a flower bed. If and . Find the area of the bed.

**Answer**:

Here, m and

Area of the flower bed (i.e.. , shaded portion)

area of quadrant of a circle of radius R of the quadrant of a circle of radius r