Parts of a Circle
A diameter is how much larger than a radius?
2 times as large
This arc is smaller than a semi-circle and has measure less then 180o
Minor Arc
What is the formula for the circumference of a circle?
2*pi*r
What is the formula for the area of a circle?
pi*r^2
This segment goes from the perimeter of the circle to another point on the perimeter, but not through the center
chord
An arc of 90 degrees is what fraction of the total circles circumference?
1/4
A sector of 270o is what fraction of the area of the circle?
3/4
This segment has endpoints on the perimeter of a circle, and goes through its center
Diameter
Convert 60o to Radians
pi/3
This angle has its vertex on the center of the circle
Central Angle
Find the area of the sector with
measure: 85o
and
radius: 9
60.1
This Angle has its vertex on the perimeter of the circle
Inscribed Angle