Geometry 6.2E: Areas of Circles

Geometry
6.2E
Area of Circles

Multiple Choice

Review Formulas:

The formula for the circumference of a circle cannot be found by using which formula shown below?

• $$2\pi\ r$$

• $$\pi\ d$$

• $$\pi\ r^2$$

Multiple Choice

Review Formulas:

Which of the following is the correct formula to find the arc length of a circle?

• $$2\pi\ r$$

• $$\pi\ r^2$$

• $$\frac{\theta\ }{360}\times\ 2\pi\ r$$

• $$\frac{\theta\ }{360}\times\ \pi\ r^2$$

Multiple Choice

Which of the following is the formula for area of a circle?

• $$\pi\ r^2$$

• $$2\pi\ r$$

• $$\pi\ d^2$$

• $$\pi\ d$$

Area of a Circle

Multiple Choice

Find the area of the circle shown:

• $$64\pi\ in^2$$

• $$81\pi\ in^2$$

• $$144\pi\ in^2$$

• $$100\pi\ in^2$$

• $$49\pi\ in^2$$

Multiple Choice

Find the area of the circle shown.

• $$64\pi\ cm^2$$

• $$36\pi\ cm^2$$

• $$100\pi\ cm^2$$

• $$121\pi\ cm^2$$

• $$81\pi\ cm^2$$

Math Response

What is the area of a circle that has a radius of 9.1 cm? Round your answer to the nearest tenth (one decimal place).

Type answer here

Correct Answer: 260.2

Deg^°

Rad

Multiple Choice

What is the area of a circle that has a diameter of 12 inches?

• 141 $$in^2$$

• 18.8 $$in^2$$

• 113.1 $$in^2$$

• 145.3 $$in^2$$

• 153.9 $$in^2$$

Multiple Choice

What information is needed in order to use the area formula?

• Arc length

• Circumference of the circle

• Diameter

• Radius

Multiple Choice

Review Formulas:

The formula for the circumference of a circle cannot be found by using which formula shown below?

• $$2\pi\ r$$

• $$\pi\ d$$

• $$\pi\ r^2$$

Math Response

What is the radius of a circle that has a circumference of $$14\pi\$$ ?

Type answer here

Correct Answer: 7

Deg^°

Rad

Multiple Choice

What is the area of a circle that has a circumference of $$14\pi\ mi^{ }$$ ?

• $$16\pi\ mi^2$$

• $$49\pi\ mi^2$$

• $$121\pi\ mi^2$$

• $$81\pi\ mi^2$$

• $$64\pi\ mi^2$$

Tonight's Assignment