Circle Circumference

Circles Opening

Multiple Choice

The radius of a circle is

• The measurement from the center of a circle to an edge of the circle.
• The measurement around the circle
• The measurement from and edge of the circle to another edge through the center
• A line perpendicular to the diameter of the circle

Multiple Choice

The diameter of a circle is:

• The measurement around the circle.
• The distance from an edge of a circle to another edge.
• The distance from the center of the circle to an edge of a circle
• The distance from an edge of a circle to another edge through the center. 

Multiple Choice

What is the diameter?

• 8
• 16
• 10
• 4

Multiple Choice

What is the radius?

• 18
• 72
• 38
• 14

Multiple Choice

Is the red line a radius or diameter of the circle?

• Radius
• Diameter

Multiple Choice

Is the red line a radius or diameter of the circle?

• Radius
• Diameter

Multiple Choice

What does "circumference" mean?

• Space a circle takes up
• Distance around a circle
• Line from one side of a circle to another
• Line from center of circle to side

Multiple Choice

True or False: An equation for Circumference is C = πr²

• True 
• False

Multiple Select

What is the equation to find the equation of circumference of a circle?

(Tick all the correct answer)

• C = πr²

• C = 2πr

• C = 2πr²

• C = πd

For the next slide, prepare:

​- Answer sheet + scrap paper
- Pen/pencil
- Write calculation process to get your answer

Multiple Choice

Determine the radius of the penny

• 59.66 mm

• 9.5 mm

• 8 mm

• 9 mm

Multiple Choice

The homeowners association wants to enclose the playground in a fence. How much fencing will they need to purchase? What is this question asking you to find?

• area

• radius

• diameter

• circumference

Multiple Choice

Find the circumference of the circle.

Use π=22/7

• 88 in
• 44 in
• 116 square in
• None of the above

Multiple Choice

A cruise ship has a large, circular window. It has a diameter of 6 meters. What is the window's approximate circumference?

Use π=3.14

• 3 m

• 20.42 m

• 37.68 m

• 18.84 m

Multiple Choice

Find the circumference of a circle with a radius of 13.5 mm.

Use π=3.14

• 84 mm

• 84.68 mm

• 84.78 mm

• 85

Multiple Choice

A circular swimming pool is 21 feet in diameter.
How many feet around is the pool?

Use π=22/7

• 10.5 ft
• 42 ft
• 66 ft

• 132 ft

Multiple Choice

Alex has trained his puppy, Popper, to jump through a ring. According to Alex's measurements and calculations, the ring has a diameter of 3.5 feet. What is the ring's circumference?

(use π=22/7)

• 9 ft

• 10 ft

• 11 ft

• 12 ft

Multiple Choice

Randy’s circular garden has a radius of 1.5 feet. He wants to enclose the garden edging that costs $0.75 per foot. About how much will the edging cost?

• $8.00

• $7.00

• $7.50

• $8.50

Multiple Choice

The circumference is 62.8 inches.  What is the radius?

• 20 inches
• 10 inches
• 6.28 inches
• 31.4 inches

Multiple Choice

Jayne has a very large circular lollipop that has a circumference of 25.12 inches. What would the diameter of Jayne’s lollipop be? Use π = 3.14.

• 4 in.
• 8 in.
• 12 in.
• 16 in.