Pi Day & Circles

Pi Day is celebrated on March 14.  (which was chosen because it resembles 3.14)  What time does the official celebration begin?

• 3:14 PM
• 7:22 PM
• 1:59 PM
• 5:18 PM

What famous scientist was born on Pi Day in 1879?

• Archimedes
• Einstein
• Galileo
• Newton

Is pi irrational, rational, both, or neither?

• Both
• Irrational
• Rational
• Neither

What is the "formal" definition of pi?

• 22/7
• 3.1415926
• the ratio of a circle's circumference to its diameter
• the surface area of a sphere of diameter 22/7

Which fraction is a good approximation for pi?

• 22/3

• 22/9

• 22/7

• 22/5

The distance from the center of the circle to any point on the circle is called the...

• radius

• diameter

• area

• circumference

A line segment which connects 2 points of a circle AND goes through the center is called the....

• radius

• diameter

• chord

• complementary

What two formulas can you use to find the circumference?

• C = π·d

• C = π·r²

• C = 2·π·r

• C = d²

Find the circumference of the circle.

• 31.4 cm

• 78.5 cm

• 314 cm

• 15.7 cm

• 18.84

• 113.04

• 37.68

• 59.1576