Exploring Circumference and Area of Circles

What is the formula for calculating the area of a circle?

• Area = (radius^2) / pi

• Area = pi * diameter

• Area = pi * radius^2

• Area = 2 * pi * radius

What value of pi is used if the calculator does not have a pi button?

• 3.14

• 3.1416

• 3.142

• 3.1415

If the radius of a circle is 12 inches, what is the area rounded to the nearest tenth?

• 453.0 inches squared

• 452.4 inches squared

• 450.0 inches squared

• 452.5 inches squared

For a circle with a radius of 14 kilometers, what is the area in kilometers squared, rounded to the nearest tenth?

• 615.7 kilometers squared

• 615.8 kilometers squared

• 616.0 kilometers squared

• 614.0 kilometers squared

What is the area of a circle with a 9-meter radius, rounded to the nearest tenth?

• 255.0 meters squared

• 254.5 meters squared

• 254.4 meters squared

• 253.0 meters squared

Calculate the area for a circle with an 11-centimeter radius, rounded to the nearest tenth.

• 380.1 centimeters squared

• 380.0 centimeters squared

• 379.0 centimeters squared

• 381.0 centimeters squared

Without a diagram, if the radius is 2.6 inches, what is the area rounded to the nearest tenth?

• 22.0 inches squared

• 21.2 inches squared

• 21.3 inches squared

• 21.1 inches squared

For a radius of 34.1 inches, what is the area in inches squared, rounded to the nearest tenth?

• 3653.0 inches squared

• 3653.1 inches squared

• 3652.0 inches squared

• 3654.0 inches squared

What is the area of a circle with a 13.2-kilometer radius, rounded to the nearest tenth?

• 547.3 kilometers squared

• 547.4 kilometers squared

• 548.0 kilometers squared

• 546.0 kilometers squared

If the radius is 29.9 kilometers, what is the area rounded to the nearest tenth?

• 2808.5 kilometers squared

• 2808.6 kilometers squared

• 2807.0 kilometers squared

• 2809.0 kilometers squared