CBSE Class 10-Mathematics: Chapter –12 Areas Related to Circles Part 3

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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,