Circumference Pi Ratio

π is equal to circumference divided by _________________ .

• radius

• diameter

• area

• itself

The diameter of a circular pool is 24.8 feet and the circumference is 77.9 feet. What should you do to find π?

• 77.9 / 24.8

• 24.8 / 77.9

If we know the circumference of a circle is 54.3 meters, what should we do to find the diameter?

• Multiply C x π

• Divide C / π

What is the Circumference of a plastic lid if the diameter

is 7.8 cm?

• 14.3 cm

• 24.5 cm

• Use this Formula C = πd

If the diameter of a circle is 15.3 meters, what is the circumference?

• 5.76 meters

• 48.07 meters

• Use this Formula C = πd

π is a ratio.

It compares a circle's ____________

to its diameter.

• radius

• diameter

• circumference

• itself

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

What do you get when you divide the circumference of a Jack-o-Lantern by its diameter?

• Pumpkin

• Jack-o-Lantern

• Pi in the sky

• Pumpkin Pi