Parts of a Circle, Circumference and Area of a Circle

What formula is this used for:
πd

• Area

• Circumference 

• Surface Area

• Volume 

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

• Area

• Diameter

• Circumference

• Chord

What is the approximate numerical value of this sign?

• 3.11

• 3.14

• 4.13

• 6.28

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. Watch the units.

• 37.68 m²

• 37.68 m

• 18.84 m

• 18.84 m²

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