Circumference of a circle

What is the formula for a circumference?

What is the circumference of a circle with a radius of 10 cm.

• 62.8m

• 62.8cm

• 6.28cm

• 6.28m

 You can also use the formula of the circumference as 2πr

• True

• False

What is a circumference?

• Distance around a book.

• Distance around a table.

• Distance around a monitor.

• Distance around a football.

Find the perimeter of the diagram given to the left.

• 25.12m

• 251.2m

• 50.24m

• 502.4m

The diagram on the left shows:

• The circumference of the circle

• The perimeter of the circle

• The distance around the circle

• All of them

The diagram on the left shows:

• The diameter of the circle

• The radius of the circle

• The distance across the circle

• All of them

The diagram on the left shows the:

• Distance across the circle

• Distance across the circle through the origin

• Distance from the origin to any of the points on the circumference

• All of them

Which formula would you use to find the circumference of the diagram given on the right?

What is the circumference of the circle given on the left?

• 21.98mm

• 219.8mm