From the given circumference, find the radius and the diameter of the circle.

(1) 198 cm

(2) 616 cm

(3) 72.6 m

(1). Given: Circumference = 198 cm

And we know circumference of a circle is given by,

Circumference = 2πr

⇒

Substituting Circumference = 198 cm and π = 22/7,

⇒

⇒

If radius, r = 31.5 cm

Then diameter = 2r

⇒ diameter = 2 × 31.5 = 63

We can draw the circle as

Hence, radius is 31.5 cm and diameter is 63 cm.

(2). Given: Circumference = 616 cm

And we know circumference of a circle is given by,

Circumference = 2πr

⇒

Substituting Circumference = 616 cm and π = 22/7,

⇒

⇒

If radius, r = 98 cm

Then diameter = 2r

⇒ diameter = 2 × 98 = 196

We can draw the circle as

Hence, radius is 98 cm and diameter is 196 cm.

(3). Given: Circumference = 72.6 m

And we know circumference of a circle is given by,

Circumference = 2πr

⇒

Substituting Circumference = 72.6 m and π = 22/7,

⇒

⇒

If radius, r = 11.55 cm

Then diameter = 2r

⇒ diameter = 2 × 11.55 = 23.1

We can draw the circle as

Hence, radius is 11.55 m and diameter is 23.1 m.