Exercise 1.1c (center, radius and diameter of a circle)

Exercise 1.1c

A. Fill in the blanks.

1. All the radii of a circle are Equal.

2. The Diameter is the longest chord of a circle.

3. A line segment joining any point on the circle to its center is called a Radius of the circle.

4. A line segment with its end points on the circle is called a Chord.

5. Twice the radius is Diameter.

B. Find the diameter of the circle.

1. Radius = 10cm

Radius = 10 cm

Diameter = 2 x radius

= 2 x 10 = 20 cm

Diameter = 20 cm

2. Radius = 8cm

Radius = 8 cm

Diameter = 2 x radius

= 2 x 8 = 16 cm

Diameter = 16 cm

3. Radius = 6cm

Radius = 6 cm

Diameter = 2 x radius

= 2 x 6 = 12 cm

Diameter = 12 cm

C. Find the radius of the circle.

1. Diameter = 24 cm

Radius = diameter / 2

= 24 / 2 = 12 cm

Radius = 12 cm

2. Diameter = 30 cm

Radius = diameter / 2

= 30 / 2 = 15 cm

Radius = 15 cm

3. Diameter = 76 cm

Radius = diameter / 2

= 76 / 2 = 38 cm

Radius = 38 cm