Circles
A closed curve in a plane whose points are an equal distance from a fixed point called the center
Circle
A angle whose sides form a straight line or 180 degrees
Straight Angle
A triangle that has two equal sides
Isosceles Triangle
Two vertices at the end of any side
Consecutive Vertices
Vertical angles are angles that share a vertex. They also have the same what?
Measure or Degree
A straight line whose ends are on the circle but doesn’t pass through the center of the circle.
Chord
Two rays joined by the same endpoint
Angle
A triangle where all 3 angles are equal
Equiangular Triangle
The bottom side of the polygon
Base
A minute broken into 60 equal parts
Second
A line that goes from the center to a point on the circle
Radius
Any angle greater than 180 degrees but less that 360 degrees
Reflex Angle
A triangle that has no equal sides
Scalene Triangle
A plane figure that is formed by straight lines
Polygon
Line with two endpoints
Line Segment
A line that goes through the center of the circle and ends on the circle
Diameter
Two angles whose total sum is 180 degrees
Supplementary Angles
A triangle in which all 3 angles are acute
Acute Triangle
The angle formed by two consecutive sides
Interior Angle
A polygon who has interior angles of more than 180°
Concave Polygon
The perimeter, or distance around the outside of the circle
Circumference
Angles that share the same vertex and a common side
Adjacent Angles
When looking at angle measures of triangles, the angles should add up to this.
180°
A line joining two vertices that are not consecutive
Diagonal
The interior measure of a Octagon or polygon with 8 sides
1080°