Circles, Volume, and Angles

The radius is ____ the diameter.

• the same as

• half of

• twice as big as

• three times

What is the "short" version of π (pi)?

• 4.13

• 3

• 3.14

• 31.4

What is the formula to find the circumference of a circle using radius?

• C = 2πr

• C = dπ

• C = πr²

• C = base ⋅ height

What is the formula to find the circumference of a circle using diameter?

• C = 2rπ

• C = dπ

• C = πr²

• C = base ⋅ height

What is the circumference of a circle that has a diameter of 5 meters?

• 7.85 meters

• 25π meters

• 2.5π meters

• 5π meters

What is the circumference of a circle that has a radius of 10 feet?

• 10π feet

• 20π feet

• 100π feet²

• 25π feet²

What is the formula to find the area of a circle?

• A = πr²

• A = 2πr

• A = dπ

• A = length ⋅ width

What is the formula to find the area of a rectangle?

• A = πr²

• A = 2πr

• A = dπ

• A = length ⋅ width

What is the formula to find the area of a triangle?

• A = πr²

• A = 2πr

• A = 1⁄2 length ⋅ width

• A = length ⋅ width

Which measurement is not used when measuring circles?

• Radius

• Length

• Circumference

• Diameter