Parts of a Circle, Circumference and Area of a Circle

What is this symbol called?

• pi

• sigma

• radius

• omega

Which of these formulas can be used for area?

In words, describe this formula

• The area of a circle is equal to pi times the radius squared

• The circumference of a circle is equal to the pi times the diameter.

• The circumference of a circle is equal to pi times the radius squared

• The area of a circle is equal to pi times the diameter

How many degrees are there in a circle?

• 90

• 180

• 360

• 720

What is the radius?

• 18

• 72

• 38

• 14

Find Circumference. Leave answer in terms of pi (π).

• 36π

• 9π

• 4.5π

• 18π

Find Circumference. Leave answer in terms of pi (π)

• 36π

• 12π

• 6π

• 24π

What is the diameter?

• 8

• 16

• 10

• 4

What is the line that goes from the center of a circle to any point on the circle?

• Diameter

• Circumference

• Chord

• Radius

What is the circumference?

• 36

• 18π

• 108π

• 36π