# 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 .

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.

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.

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.