# CBSE Class 10-Mathematics: Chapter –12 Areas Related to Circles Part 1

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## 1 Mark Questions

Unless stated otherwise, take

**Question 1:**

The radii of two circles are and respectively. Find the radius of the circle which has circumference equal to the sum of the circumferences of the two circles.

**Answer:**

Let R be the radius of the circle which has circumference equal to the sum of circumferences of the two circles, then according to question,

**Question 2:**

The circumference of a circular field is 528 cm. Then its radius is

(a)

(b)

(c)

(d)

**Answer:**

(b) 84 cm

**Question 3:**

The circumference of a circle exceeds its diameter by 180 cm. Then its radius is

(a)

(b)

(c)

(d)

**Answer:**

(d)

**Question 4:**

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

(a)

(b)

(c)

(d) None of there

**Answer:**

(b)

**Question 5:**

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

(a)

(b)

(c)

(d)

**Answer:**

(d)

**Question 6:**

If the sum of the circumferences of two circles with radii and is equal to the circumference of a circle of Radius , then

(a)

(b)

(c)

(d) None of these

**Answer:**

(a)

**Question 7:**

If the perimeter of a circle is equal to that of a square, then the ratio of their area is

(a)

(b)

(c)

(d)

**Answer:**

(c)

**Question 8:**

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

(a)

(b)

(c)

(d)

**Answer:**

(d)