Circles and Arcs Flashcards
1
Q
Radius
A
A segment with an endpoint at the center and a point on the circle.
2
Q
Diameter
A
A segment with endpoints on the circle and passes through the center point. d = 2r
3
Q
Central Angle
A
An angle whose vertex point is the center point and sides are radii of the circle. Centeral angle measure (degrees) is congruent to it’s Arc measure (degrees).
4
Q
Semi Circle
A
Arc with measure 180 degrees. Named with 2 or 3 upper case letters
5
Q
Minor Arc
A
Arc measure less than 180 degrees. Named with 2 upper case letters
6
Q
Major Arc
A
Arc measure greater than 180 degrees. Named (typically) with 3 upper case letters.
7
Q
Arc Addition Postulate
A
The measure of the arc formed by two adjacent arcs is the sum of the measure of the two arcs.
