SOAR Geo | 9-2 Area of a Circle

Multiple Choice

Which formula is used to find the area of a circle?

• $$A=\pi r^2$$

• $$A=\frac{r^2}{2}$$

• $$A=2\pi r$$

• $$A=\pi d$$

Multiple Choice

What does the area of a circle measure?

• The area of a circle measures the distance around it.
• The area of a circle measures its diameter.
• The area of a circle measures the space enclosed within its circumference.
• The area of a circle measures the length of its radius.

Match

Match each variable/constant in the formula with the correct description.

• $$A$$

• $$\pi$$

• $$r$$

Area

Pi (about 3.14)

radius

• Area

• Pi (about 3.14)

• radius

Multiple Choice

What does it mean to square a number?

• Multiplying it by three.

• Multiplying a number by itself

• Adding it to itself twice.

• Divide it by two.

Multiple Choice

How are the radius and diameter of a circle related?

• The diameter is twice the radius.
• The radius and diameter are equal.
• The diameter is half the radius.
• The radius is twice the diameter.

Multiple Select

What is π?

• π is approximately 3.14159.
• π is an irrational number (it never ends!)

• π is the ratio of the circumference & diameter of a circle.

• π is a letter in the Greek alphabet.

Multiple Choice

Which formula would you used to find the area of this circle?

• A = 4 ft × 4 ft

• A = π(4 ft)²

• A = π(4 ft)

• A = 2π(4 ft)

Math Response

What is the area of this circle?

Round to the nearest hundredth.

Type answer here

Correct Answer: 50.24

Deg^°

Rad

Multiple Choice

What are the correct units for the area of this circle?

• 50.24 feet

• 50.24 feet²

• 50.24 inches

• 50.24 inches²

Multiple Choice

Which formula would you used to find the area of this circle?

• $$A=2\pi(2)$$

• $$A=\pi(2)$$

• $$A=4^2$$

• $$A=\pi(2)^2$$

Math Response

What is the area of this circle?

Round to the nearest hundredth.

Type answer here

Correct Answer: 12.56

Deg^°

Rad

Multiple Choice

What are the correct units for the area of this circle?

• 12.56 miles

• 12.56 miles²

• 12.56 miles³

• 12.56 feet

Multiple Choice

Which formula would you used to find the area of this circle?

• $$A=\pi(22)$$

• $$A=\pi(11)^2$$

• $$A=\pi(22)^2$$

• $$A=2\pi(11)$$

Math Response

What is the area of this circle?

Round to the nearest hundredth.

Type answer here

Correct Answer: 379.94

Deg^°

Rad

Multiple Choice

What are the correct units for the area of this circle?

• 379.94 mm

• 379.94 mm²

• 379.94 m

• 379.94 m³