**Basic Geometrical Ideas**

**Exercise 4.6**

Examples for Practice

1). From the figure, identify:

(a) the centre of the circle

O is the centre of the circle.

(b) three radii

Radius OA, OB, OC

(c) a diameter

AC is the diameter.

(d) a chord

ED is a chord. AC is also a chord.

(e)two points in the interior

O and P are the two points in the interior

(f) a point in the exterior

Q is a point in the exterior.

(g) a sector

AOB is a sector

(h) a segment

ED is a segment.

2)

(a) is every diameter of a circle also a chord?

Yes. The diameter is the longest chord of a circle.

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

No.

3). Draw any circle and mark

(a) it’s centre

(b) a radius

(c) a diameter

(d) a sector

(e) a segment

(f) a point in its interior

(g) a point in its exterior

(h) an arc

4). Say true or false:

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

True.

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

True.

Click here for the solutions of

Chapter 4 Basic Geometrical Ideas

Chapter 3: Playing With Numbers

Chapter 2: Whole Numbers

Chapter 2: Knowing Our Numbers