Circle Review

The measure of the entire circle is __________ degrees.

The measure of a semicircle is __________ degrees

Circumference of a Circle: C = ______ (Provide the formula for the circumference of a circle)

• C = 2r
• C = r^2
• C = 2πr

Find the circumference of a circle with radius 11 meters.

• 22π meters
• 44π meters
• 33π meters
• 55π meters

Area of a Circle: A = ______ (Provide the formula for the area of a circle)

• A = 2πr
• A = r^2
• A = 0.5πr^2
• A = πr^2

Find the indicated arc measure.

a) m∠CD

• 30 degrees
• 75 degrees
• 65 degrees

• 45 degrees

Find the indicated arc measure.

b) m∠EFD

• 80°
• 120°
• 100°
• 45°

The Jones family wants to enclose their circular garden with a fence. To the nearest foot, what is the minimum length of fencing they need to buy?

• 56.25 ft
• 246 ft
• 365 ft
• 393 ft

Find the circumference of the following circle:

• 4π ft

• 16π ft

• 2π ft

• 8π ft

The radius of the circle is 9 meters.  What is the circle's circumference?

• 9 meters
• 28.26 meters
• 56.52 meters
• 18 meters