# CBSE Class 10-Mathematics: Chapter – 12 Areas Related to Circles Part 14 (For CBSE, ICSE, IAS, NET, NRA 2022)

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**Question 41**:

Find the area of a sector of a circle with radius 6 cm if angle of the sector is .

**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 264 cm, 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.

**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 25 cm 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.

**Answer**:

Area of shaded region