Area and Circumference of a Circle

Which line is the diameter?

• All the way across the circle

• Halfway across the circle

• The middle of the circle

Which line is the radius?

• All the way across the circle

• Halfway across the circle

• The middle of the circle

What is the formula used to find the circumference of a circle?

• C = πr

• C = πd

• C = πr²

• C = 2πd

What does the letter d stand for in the formula for the circumference of a circle?

• radius

• diameter

• donuts

• dog

What is the circumference of this circle? Use 3.14 for pi.

• 81.66 ft

• 56.52 ft

• 58.85 ft

Find the circumference of the circle. Use 3.14 for pi.

• 81.64 ft

• 82.63 ft

• 93 ft

Find the circumference of the circle. Use 3.14 for pi.

• 75 ft

• 75.08 ft

• 69.08 ft

Find the circumference of the circle. Use 3.14 for pi.

• 12 ⋅ 2 = 24, then

  24 ⋅ 3.14

• 12 + 12 = 24, then 24 ⋅ 3.14

• 12 + 2 = 14, then

  14 ⋅ 3. 14

What is the diameter of this circle?

• 8 yards

• 64 yards

• 16 yards

What does circumference mean?

• Distance around a circle

• Space a circle takes up

• Line from the center of a circle to the side of the circle

• Line from one side of a circle to the other