CBSE Class 10-Mathematics: Chapter –12 Areas Related to Circles Part 14
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Question 41:
Find the area of a sector of a circle with radius 6cm if angle of the sector is .

Angle of the Sector
Answer:
We know that Area of sector
Here,
Required area
Question 42:
A wheel has diameter , find how many complete revolutions it must make to complete meters.
Answer:
Diameter, Distance covered in one revolution circumference
Thus, for distance covered 264cm, number of revolution
Number of revolutions
Question 43:
The given figure is a sector of a circle of radius . Find the perimeter of the sector.

Perimeter of a Sector of Angle
Answer:
We know that circumference i. e, perimeter of a sector of angle of a circle with radius R
Required perimeter
Question 44:
A car had two wipers which do not overlap. Each wiper has a blade of length 25cm sweeping through an angle of . Find the total area cleaned at each sweep of the blades.
Answer:
Radius of each wiper , Angle
Total area cleaned at each sweep of the blades
Question 45:
In the given figure arcs have been drawn with radii each and with centres P, Q and R. Find the area of the shaped region.

Find the Area of the Shaped Region
Answer:
Area of shaded region