Circumference Area

Mod.8 Circles Review

Circumference and Area

​Warm Up:

What two formulas can be used to find the circumference of a circle?

​WE do:

The circumference of a circular garden is 106.76 feet. What is the diameter of the garden? Use 3.14 for π and do not round your answer.

Math Response

The circumference of a circular garden is 12.56 feet. What is the diameter of the garden? Use 3.14 for π and do not round your answer.

Type answer here

Correct Answer: 4

Deg^°

Rad

​We do:

Find the circumference of a circle with a diameter of 5 yds. Use 3.14 for π. Do not round your answer.

Multiple Choice

Find the circumference a circle with a diameter of 12 cm. Use 3.14 for π. Round your answer to the nearest hundredth.

• 18.84 cm

• 75.36 cm

• 37.68 cm

​We do:

Find the area of a circle with a diameter of 5 yds.

Use 3.14 for π. Do not round your answer.

Multiple Choice

Find the area of the circle, giving your answer to 1 decimal place.

• 3.1 cm²

• 12.6 cm²

• 6.3 cm²

• 50.3 cm²

​We do:

Find the circumference of a circle with a radius of 5 m. Write your answers in terms of π. Do not round your answer and be sure to include the correct units in your answers.

Multiple Choice

Find the Circumference for a Circle with a radius of 4 in.

Write your answers in terms of π. Do not round your answer, and be sure to include the correct units in your answers.

• 4π in.

• 5π in.

• 8π in²

• 7π in.

• 8π in.

​We do:

Find the area of a circle with a radius of 5 m. Write your answers in terms of π. Do not round your answer and be sure to include the correct units in your answers.

Multiple Choice

Find the area of a circle with a radius of 8 cm. Write your answers in terms of π.

Do not round your answer, and be sure to include the correct units in your answers.

• $$8\pi\ cm^2$$

• $$64\pi\ cm^2$$

• $$16\pi\ cm^2$$

• $$64\pi\ cm$$