CBSE Class 10-Mathematics: Chapter –12 Areas Related to Circles Part 21
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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 )

A Round Table Cover Has Six Equal Designs
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 .

Find the Area of the Shaded Region
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.

ABCD is a Flower 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