Ratio of Circumference and Diameter

π is a ratio.

It compares a circle's ____________

to its diameter.

• radius

• diameter

• circumference

• itself

What is π ? (Best Choice)

• The ratio of the circumference of any circle to its diameter.

• Exactly 3.14

• Exactly 3.1415

• Exactly 3.141593

A circular track with a diameter of 60 meters is shown. Shaleah walked around the track 4 times. Approximately how many meters did she walk?

• 377

• 2826

• 754

• 11,304

Jayne has a very large circular lollipop that has a circumference of 25.12 inches. What would the diameter of Jayne’s lollipop be? Use π = 3.14.

• 4 in.

• 8 in.

• 12 in.

• 16 in.

Find the circumference of a circle with a diameter of 11 millimeters.

• 34.6 mm

• 30 mm

• 25.3 mm

• 34.54 mm

The ratio of the Circumference to the diameter of the circle

• area

• circumference

• pi

• Mrs. McDonald

Pi is approximately ______.

• 3.14

• 31.4

• .314

• 3.1.4

Pi is the ratio of a circle's ______ and ______.

• diameter and circumference

• circumference and radius

• Radius and diameter

• circumference and diameter

What ancient Greek mathematician found the ratio between a circle's circumference and diameter?

• Archimedes

• Pythagoras

• Hypatia

• Euler

True/False: Pi is an IRRATIONAL number.

• TRUE

• FALSE