**Circumference of a circle is the measure of the length of the circle.**

**Circumference of a circle = 2πr**

## Finding circumference of a circle when radius is given

**Question 1**

Find the circumference of a circle of radius 7 cm?

**Explanation**

The radius of given circle is r = 7 cm

Circumference of the circle = 2πr

= ( 2 x x 7 ) cm

= 44 cm

**Question 2**

Find the circumference of a circle of radius 28 cm?

**Explanation**

The radius of given circle is r = 28 cm

Circumference of the circle = 2πr

= ( 2 x x 28 ) cm

= 176 cm

**Question 3**

Find the circumference of a circle of radius 49 cm?

**Explanation**

The radius of given circle is r = 49 cm

Circumference of the circle = 2r

= ( 2 x x 49 ) cm

= 308 cm

**Question 4**

Find the circumference of a circle of radius 3.5 cm?

**Explanation**

The radius of given circle is r = 3.5 cm

Circumference of the circle = 2r

= ( 2 x x 3.5 ) cm

= 22 cm

## Finding circumference of a circle when diameter is given

**Question 1**

Find the circumference of a circle, whose diameter is 14 cm?

**Explanation**

The diameter of given circle = 14 cm

Then, radius = = cm = 7 cm

Circumference of circle = 2πr

= ( 2 x x 7 ) cm

= 44 cm

**Question 2**

Find the circumference of a circle, whose diameter is 56 cm?

**Explanation**

The diameter of given circle = 56 cm

Then, radius = = cm = 28 cm

Circumference of circle = 2πr

= ( 2 x x 28 ) cm

= 176 cm

**Question 3**

Find the circumference of a circle, whose diameter is 140 cm?

**Explanation**

The diameter of given circle = 140 cm

Then, radius = = cm = 70 cm

Circumference of circle = 2r

= ( 2 x x 70 ) cm

= 440 cm

**Question 4**

Find the circumference of a circle, whose diameter is 98 cm?

**Explanation**

The diameter of given circle = 98 cm

Then, radius = = cm = 49 cm

Circumference of circle = 2r

= ( 2 x x 49 ) cm

= 308 cm

**Learn More…**

Perimeter of Rectangle

Perimeter of Square

Perimeter of Triangle

Perimeter of Equilateral Triangle

Perimeter of regular pentagon

Perimeter of regular octagon

Perimeter of regular decagon

Area of Rectangle

Area of Square

Finding Diameter of a circle when circumference is given

Finding Radius of a circle when circumference is given

Finding Perimeter of Rectangle when Area & Breadth given

Finding Perimeter of Rectangle when Area & Length given

Find the dimensions of a rectangle

Find the cost of fencing of a rectangular field

Find the cost of carpeting the room

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