Quiz on Pi and Circle Properties

Which definition describes π?

• The ratio of the circumference of a circle to its diameter

• The ratio of the circumference of a circle to its radius

• The radius of a circle times 2 times 3.14

• The diameter of a circle times 2 times 3.14

The circumference of a circle is C inches. The diameter of the circle is 19 inches. Which expression best represents the value of π?

• C/19

• 19/C

• C/9.5

• 9.5/C

A circle has an area of approximately 28.26 square centimeters. Which measurement is closest to the radius of the circle in centimeters?

• 3 cm

• 6 cm

• 5 cm

• 9 cm

A sprinkler rotates and sprays water onto a lawn. The part of the lawn watered by the sprinkler is in the shape of a circle with the diameter shown in feet. Which measurement is closest to the area in square feet of the part of the lawn watered by the sprinkler?

• 1,231 ft²

• 44 ft²

• 615 ft²

• 154 ft²

A sundial has a circular base with a diameter of 90 feet. What is the area of the circular base in square feet?

• 3,627.5 ft²

• 282.6 ft²

• 141.3 ft²

• 6,358.5 ft²

A circle has a radius of 4.5 centimeters. Which measurement is closest to the circumference of the circle in centimeters?

• 14.13 cm

• 28.26 cm

• 63.59 cm

• 56.52 cm

The radius of circle S is half the radius of circle L. The radius of circle L is 8 millimeters. Which measurement is closest to the area of circle S in square millimeters?

• 50.24 mm²

• 25.12 mm²

• 200.96 mm²

• 12.56 mm²

What is the area of the barn wall in square feet?

• 231 ft²

• 225 ft²

• 237 ft²

• 249 ft²

What is the area of the figure in square feet?

• 15 square feet

• 12 square feet

• 10 square feet

• 18 square feet

What is the perimeter of the figure in feet?

• 16 feet

• 18 feet

• 20 feet

• 22 feet