Parts of a Circle and Circumference

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

• Area

• Diameter

• Circumference

• Chord

Choose the answer which best describes how these formulas are related to each other.

• They both solve for circumference. In the first formula it uses diameter, in the second formula it uses two times the radius, which is the same thing as diameter.

• They both solve for circumference, in the first uses diameter and the second uses pi.

• They both solve for area. In the first formula it uses diameter, in the second formula it uses two times the radius, which is the same thing as diameter.

• They both use circumference to solve for pi. One uses radius, the other uses diameter.

Find Circumference. Watch the units.

• 28.26 ft²

• 28.26 ft

• 28.26

• 56.52 ft

Find Circumference.

• 87.92 cm

• 43.96 cm

• 21.98 cm

• 3.14 cm

Find Circumference. Round to the nearest hundredths.

• 40.69 yd

• 5.65 yd

• 11.30 yd

• 22.61 yd

Find Circumference. Round to nearest hundredths

• 14.13 km

• 56.52 km

• 28.26 km

• 63.59 km

What is line CB called?

• Circumference

• Diameter

• Radius

• Chord

What is line AD called?

• Area

• Circumference

• Radius

• Diameter

What is the approximate numerical value of this sign?

• 3.11

• 3.14

• 4.13

• 6.28

What is the actual definition of this sign?

• It's the line going across the circle and going through the center

• It's the line going from the center to the edge of a circle

• It's the ratio of the circumference to the diameter of a circle.

• It's any line that goes through the circle but doesn't go through the middle.