Clue
Circle Vocabulary
Around We Go!
Inside the Circle
Pi Detectives
100

This Greek letter represents the number approximately equal to 3.14.

What is Pi....( )

100

This is the distance around a circle

What is circumference?

100

Complete the circumference formula:

C=(pi) x __.

What is diameter?

100

This measurement tells how much flat space is inside a circle.

What is area?

100

Pi Day falls on this date, written as 3/14 in the United States.

What is March 14?

200

These are the first three digits of pi, including the digit before the decimal.

3,1, and 4

200

This is the distance from the center of a circle to its edge.

What is radius?

200

A circle's diameter is 10 centimeters. This is its approximate circumference.

What is 31.4 centimeters?

200

Complete the circle area formula:

A = (pi) x __.

What is radius squared?

who can write "radius squared"

200

Which is closer to pi:

3, 3.14, or 3.5 

3.14

300

Pi equals a circle's circumference divided by this measurement.

What is its diameter?

300

This line segment passes through the center and connects two points on a circle's edge.

What is the diameter?

300

A circle's radius is 5 meters. This is its approximate circumference.

What is 31.4 meters?

300

A circle has a radius of 3 centimeters. This is its approximate area.

What is 28.26 square centimeters?

300

True or False: A basketball hoop and a bracelet have the same circumference-to-diameter ratio.

True

400

Pi is called this kind of number because it cannot be written exactly as a fraction of two intergers.

What is an irrational number?

400
A circle has a radius of 7 centimeters. This is its diameter.

What is 14 centimeters?

400

A circle's circumference  is 62.8 inches. Using 3.14 for pi, this is its diameter.

What is 20 inches?

400

A circle has a diameter of 10 meters. This is its approximate area.

What is 78.5 square meters?

400

A student says doubling a circle's diameter doubles its circumference. Is the student correct?

yes

500

True or False: The decimal digits of pi eventually end or repeat in a fixed pattern.

False

500

A circle has a diameter of 18 inches. This is its radius.

What is 9 inches?

500

A wheel has a diameter of 20 centimeters. It rolls three complete turns without slipping, traveling approximately this far.

What is 188.4 centimeters?

500

If a circle's radius doubles, its area becomes this many times as large.

What is four times?

500

Using the digits of pi, 3.14159, this is pi rounded to three decimal places.

What is 3.142?