Vocab
The point in the middle of the circle
Center
A segment that goes from the center to the edge of the circle
Radius
What is the formula to find area of a circle?
A= pi r^2
What is the formula for circumference of a circle?
c=pi d or c=2pi r
The line that touches both ends of the circle and goes through the center
Diameter
The point where a tangent touches a circle.
Point of Tangency
What is the area of a circle with a radius of 5 inches?
About 78.5 square inches
How much crust is on a 12 inch pizza?
About 37.7 inches
A segment that has both endpoints on the circle
Chord
A portion of the circle's circumference
Arc
What is the area of a circle with a diameter of 12 centimeters?
About 113.1 cm
How much whipped cream would go around the edge of a pie that has a radius of 4 inches?
About 25.13 inches
An angle whose vertex is the center
Central angle
An arc that is more than half of the circle
Major Arc
What is the area of one slice of a 16 inch pizza if it is cut into 8 equal slices?
About 25.13 square inches
How much crust would you eat on one slice of pizza if you ordered a 14 inch pizza and cut it into 10 equal slices?
About 4.4 inches
A line that touches the circle at exactly one point
Tangent line
An arc that is less than half of the circle
Minor arc
What is the area of a slice of pie cut at a 45 degree angle if the radius is 8 inches?
About 25.13 inches
How much whipped cream would you eat (assuming it goes around the edge of a pie) if you ate a 35 degree slice of a pie that has a radius of 10 cm?
About 6.1 inches