# NCERT Mathematics Class 9 Exemplar Ch 10 Circles Part 1

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**Exercise 10.1**

1. AD is a diameter of a circle and AB is a chord. If , , the distance of AB from the centre of the circle is :

(A)

(B)

(C)

(D)

Answer: D

2. In Fig. 10.3, if , and OD is perpendicular to AB, then CD is equal to:

(A)

(B)

(C)

(D)

Answer: A

3. If, and AB is perpendicular to BC, then the radius of the circle passing through the points A, B and C is:

(A)

(B)

(C)

(D)

Answer: C

4. In Fig.10.4, if, then ∠AOC is equal to:

(A)

(B)

(C)

(D)

Answer: B