Identify Diameter Radius

What is the formula for Circumference of a circle?

• C= π d

• C= π r

• C= 2(π d)

What is the circumference of this circle?

• 37.68

• 18.84

• 452.16

The particle accelerator at Fermilab has a radius of 0.62 miles. How long is it all the way around the particle accelerator? Round to nearest tenth.

The distance from the center of the circle to any point on the circle is called the...

• radius

• diameter

• area

• circumference

If the radius of a circle is 8 cm, the diameter is 16 cm.

• TRUE

• FALSE

If the diameter of a circle is 10 cm, the radius is 5 cm.

• TRUE

• FALSE

If my radius is 10ft, what is my diameter?

• 20ft

• 5ft

• 31.4ft

• 62.8ft

A circle has a diameter of 36 ft. What is the radius?

• 18

• 72

• 14

What is the diameter of a circle if the radius is 8 cm?

• 8 cm

• 16 cm

• 4 cm

Find the radius of a circle who's diameter is 40 ft.

• 40ft

• 80ft

• 20ft

• 45ft