Vocab
This part of a circle goes from the center of the outer edge
Radius
What is the decimal version of pi?
3.14
360 degrees is equal to how many radians?
2pi
Describe what a sector is
A section of the circle, a piece of the pie
What is the distance around a circle called?
Circumference
This point is in the middle of the circle
Center
What is the fraction version of pi?
22/7 or 3 1/7
Pi is equal to how many degrees?
180
Which pizza was the best deal in the pizza dilemma?
How many degrees are in a circle?
360
This part of the circle goes entirely across the circle and passes through the center
Diameter
Pi represents the ratio between what two parts of a circle?
Circumference and diameter
Positive degrees move which direction on the coordinate plane?
Counterclockwise
What is the formula for area of a sector?
pi * r squared * theta / 360
What is the minimum number of people that should be surveyed for the results to be valid?
20
This is a "piece of the pie"
Sector
Who was the first person to use the Greek letter for pi to represent the number?
William Jones
Negative degrees move which direction on the coordinate plane?
clockwise
Why do we divide by 360 in the formula of area of a sector?
All of the percentages in a pie chart should add up to...?
100%
This is a part of the outer edge of a circle
Arc
What year did Pi day become a national holiday in the U.S.?
2009
-120 degrees is equal to what in radians
-2/3pi
What does theta represent in the formula for area of a sector?
the central angle
Marching in a circle and eating pies?