# CBSE Class 10-Mathematics: Chapter – 12 Areas Related to Circles Part 3 (For CBSE, ICSE, IAS, NET, NRA 2022)

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**Question 17**:

The radius of a circle is , then the area of the circle is

(a)

(b)

(c)

(d)

**Answer**:

(d)

**Question 18**:

Area of a sector of angle of a circle with radius is

(a)

(b)

(c)

(d)

**Answer**:

(a)

**Question 19**:

The diameter of a circle whose area is equal to the sum of the area of the two circles of radii and is

(a)

(b)

(c)

(d)

**Answer**:

(a)

**Question 20**:

The circumference a circle is . Then its area is

(a)

(b)

(c)

(d)

**Answer**:

(a)

## 2 Mark Questions

**Question 1**:

The radii of two circles are and respectively. Find the radius of the circle having area equal to the sum of the areas of the two circles.

**Answer**:

Let R be the radius of the circle which has area equal to the sum of areas of the two circles, then

According to the question,