Circumference

The distance around the outside of the circle is called the?

• Area

• Diameter

• Circumference

• Radius

If you are given the radius, how do you calculate the diameter?

• Subtract 2 from the radius

• Add 2 to the radius

• Divide the Radius by 2

• Multiply the radius by 2

If the radius is 6, what is the diameter?

If the diameter is 4, what is the radius?

If you are given the diameter, which formula should you use?

• C = 2πr

• C =πd

What is the circumference of this circle?

What is the circumference of this circle?

If the circumference of the circle is 28.26 cm, what is the diameter?

See if you can solve this one before you watch the video.

The Circumference is 94.2. Find the radius. Use the formula

C=2π2

The radius is?

• 12

• 15

• 6.28

• 3.14