SOAR Geo | 9-1 Circumference of a Circle

Multiple Choice

What does the circumference of a circle measure?

• The distance around the circle.
• The area of the circle.
• The diameter of the circle.
• The radius of the circle.

Multiple Choice

What does it mean to square a number?

• Multiplying it by itself

• Subtracting it from one.

• Dividing it by two.

• Adding it to itself.

Multiple Select

Which formulas can be used to calculate circumference?

• $$C=4\pi d$$

• $$C=\pi r^2$$

• $$C=2\pi r$$

• $$C=\pi d$$

Match

Match the each variable or constant with the correct label:

$$C=2\pi r$$

• $$C$$

• $$\pi$$

• $$r$$

circumeferenc

Pi (about 3.14)

radius

• circumeferenc

• Pi (about 3.14)

• radius

Match

Match the each variable or constant with the correct label:

$$C=\pi d$$

• $$C$$

• $$\pi$$

• $$d$$

circumeferenc

Pi (about 3.14)

diameter

• circumeferenc

• Pi (about 3.14)

• diameter

Multiple Select

What is π?

• π is approximately 3.14159.
• π is the Greek letter pi.

• π is an irrational number (it never ends!)

• π is the ratio of a circle's circumference & diameter

Math Response

The radius of a circle is 2 feet.

What is the circle's circumference?

Use ​𝜋 ≈ 3.14 and round your answer to the nearest hundredth.

Type answer here

Correct Answer: 12.56

Deg^°

Rad

Math Response

The radius of a circle is 3 inches.

What is the circle's circumference?

Use ​𝜋 ≈ 3.14 and round your answer to the nearest hundredth.

Type answer here

Correct Answer: 18.8

Deg^°

Rad

Math Response

The diameter of a circle is 4 feet.

What is the circle's circumference?

Use ​𝜋 ≈ 3.14 and round your answer to the nearest hundredth.

Type answer here

Correct Answer: 12.56

Deg^°

Rad