Chapter-4: Basic Geometrical Ideas

Exercise 4.6

Q1. From the figure, identify:

(a) The centre of circle.

(b) Three radii.

(c) A diameter.

(d) A chord.

(e) Two points in the interior.

(f) A point in the exterior.

(g) A sector.

(h) A segment.

Ans.

Q2. (a) Is every diameter of a circle also a chord?

(b) Is every chord of a circle also a diameter?

Ans.

(a) Yes, every diameter of a circle is also a chord.

(b) No, every chord of a circle is not a diameter.

Q3. Draw any circle and mark:

(a) Its centre

(b) A radius

(c) A diameter

(d) A sector

Ans.

(a) Its centre is O

(b) A radius is OB

(c) A diameter is AC

(d) A sector OAB

Q4. Say true or false:

(a) Two diameters of a circle will necessarily intersect.

(b) The centre of a circle is always in its interior.

Ans.

(a) True

(b) True