Area
Circumference
Vocabulary
History
Challenge Questions
100

The area of a circular cookie, if the radius is 2 inches (use 3.14 for pi)

What is 12.56 inches squared?

100

The circumference of a circle if the radius is 12 (use 3.14 for pi)

What is 75.4?

100

A line segment from one point of a circle to the center point

What is radius?

100

The reason why March 14 chosen to be pi day.

It is 3.14 (March 14), and it is Albert Einsteins birthday.

100

The radius of a circle that has a circumference of 615.44 units.

What is 98 untis?

200

The formula for the area of a circle.

What is Pi R^2?

200

The formula for the circumference of a circle

What is 2 Pi R?

200

What is the line segment that goes from one point of the edge of the circle to another?

What is diameter?

200

The year was pi day founded.

What is 1988?

200

You are standing next to a large circular lake. You want to measure the diameter, but you don't want to swim across the lake. You walked around the lake and the circumference was 400 Pi meters. What is the diameter?

400 meters

300

The area of a rectangular wooden board, 20 in. wide and 40 in. long, with a circular hole cut out of it. The diameter of the circle is 6 in.

What is 9 Pi or about 28.26?

300

The circumference of a circle when the diameter is 4 (use 3.14 for pi)

What is 12.56?

300

What is pi?

What is ratio of circumference of a circle to its diameter (Circumference/diameter= Pi)?

300

The person who founded pi day.

Who was Larry Shaw?

300

Shawn is coasting down a 500 cm long ramp on his inline skates. The wheels on his inline skates are 32 cm in circumference. How many rotations does each wheel make while Shawn is coasting down the ramp? Round your answer to the nearest rotation.

16 rotations

400

The area of a circle that has a circumference of 37.68 units. (Use 3.14 for pi)

What is 113.04 units squared?

400

The radius of a circle that has a circumference of 153.86 units.

What is 24.5 units?

400

What the circumference measures.

What is the distance around a circle?

400

The year that pi day became an official national holiday.

What is 2009?

400

An engineer is planning a new water pipe installation. The circular pipe has a diameter of d=20 cm. What is the area of the circular cross section of this pipe? (Give your answer in terms of pi)

100 Pi cm^2

500

The area, in terms of pi, if the diameter of a circle is 8. (use 3.14 for pi)

What is 16 Pi?

500

The diameter of a circle that has a circumference of 1133.54. (use 3.14 for pi)

What is 361 units?

500

The definition of an interior point.

What is a point inside of a circle?

500

The first person credited with accurately estimating the value of pi.

Who was Archimedes?

500

The area of a 1/4 of a circle that has a radius of 2. (Tell your answer in terms of pi)

What is pi units^2?

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