Understanding the Area of Circles

What is the correct calculation to find the distance a dog runs with an 8-foot leash?

• Calculate the circumference of the circle

• Calculate the area of the circle

• Calculate the radius of the circle

• Calculate the diameter of the circle

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

• Area = pi * diameter

• Area = pi * radius

• Area = 2 * pi * radius

• Area = pi * radius squared

Why might you use 22/7 as an approximation for pi?

• When the radius is a multiple of 3

• When the diameter is a multiple of 7

• When the radius is a multiple of 7

• When the diameter is a multiple of 3

How do you find the area of a circle if given the diameter?

• Divide the diameter by pi

• Multiply the diameter by pi

• Convert the diameter to radius first

• Use the diameter directly in the formula

How do you round 32.1536 to the nearest tenth?

• 32.1

• 32.2

• 32.15

• 32.16

What is the first step in calculating the area of a semi-circle?

• Find the radius if given the diameter

• Use the full circle area formula

• Multiply the diameter by pi

• Double the radius

What is the area of a full circle if the radius is 15 feet?

• 452 square feet

• 113 square feet

• 225 square feet

• 706.5 square feet

What is the formula for the area of a semi-circle?

• Area = 1/2 * pi * diameter squared

• Area = pi * diameter squared

• Area = 1/2 * pi * radius squared

• Area = pi * radius squared

If a semi-circle has a radius of 6 cm, what is its approximate area using pi = 3.14?

• 113 cm²

• 36 cm²

• 56.5 cm²

• 28.3 cm²

In a basketball court, a semi-circle has a radius of 6 feet. What is its area?

• 113 square feet

• 36 square feet

• 56.5 square feet

• 28.3 square feet