Circumference of a Circle Lesson

Circumference of a Circle

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In your opinion, which one is the best companion of all?

Warm-Up

Multiple Choice

Diameter 32 inches
What is the radius?

• 16 inches
• 64 inches
• 96 inches
  96 inches
• 16 ft 

Multiple Choice

If my radius is 10ft, what is my diameter?

• 20ft
• 5ft
• 31.4ft
• 62.8ft

​Let's see what you remember about Circumference of a circle

Multiple Choice

What is the measurement around the outside of a circle called?

• Diameter

• Circumference

• Radius

• Center

Multiple Choice

What is another name for "circumference"?

• Circus

• Perimeter of the circle

• Area of the circle

• On top of the circle

​​Formulas for Circumference​

Multiple Choice

What is the formula for finding the circumstance of a circle with just the diameter?

• C = πd

• C = bh

• C = lwh

• I do not know

Multiple Choice

Other than the formula C = πd what is another formula for circumference of a circle?

• C = 2π

• C = 2πr

• C = πr²

• C = πd²

Multiple Choice

Find the circumference of the circle.

• 78.5

• 15.7 ft

• 62.8 ft

• 31.4 ft

Multiple Choice

Find the circumference (to the nearest whole number)

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

Match

Match the following:

• 2r

• $$\frac{d}{2}$$

• πd

• π

d =

r =

C =

3.14 =

• d =

• r =

• C =

• 3.14 =

Multiple Choice

Find the circumference of the circle.

• 125.6 km

• 31.4 km

• 62.8 km

• 15.7 km

Multiple Choice

Find the circumference of the circle.

• 18.84 cm

• 9.42 cm

• 37.68 cm

• 4.71 cm

Match

Match the following

• The number of diameter lengths it takes to make a circumference of a circle.

  3.14

• The distance around a circle. Perimeter of a circle.

• The distance from the center of a circle to its edge.

• The longest distance across a circle through its center.

Circumference

Radius

Diameter

• $$\pi$$

• Circumference

• Radius

• Diameter

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