Basic Geometry
An exact position or location
Point
An angle that measures less than 90 degrees
Acute Angle
A polygon with 3 straight sides
Triangle
The set of points that are the same distance (equidistant) away from a center point
Circle
Any shape with corners and straight sides
Polygon
A set of points extending infinitely in both directions
Line
An angle that measures more than 90 degrees but less than 180 degrees
Obtuse Angle
A triangle with all equal sides and angles
Equilateral Triangle
The distance from the center of a circle to any point on the circle
Radius
A line or segment that goes through the midpoint of a segment and is perpendicular to the segment
Perpendicular Bisector
A portion of a line with two endpoints
Line Segment
An angle that measures exactly 180 degrees
Straight Angle
A triangle with two equal sides and angles
Isosceles Triangle
A segment that goes through the center of a circle and has endpoints on the circle ; twice the radius
Diameter
A line or segment that splits an angle into two congruent parts
Angle Bisector
A flat 2D surface that extends infinitely
Plane
An angle that measures exactly 90 degrees
Right Angle
A triangle with no equal sides
Scalene Triangle
Half of a circle
Semicircle
The shared point of an angle's rays / segments
Vertex
A set of points that extends infinitely in one direction but has an endpoint in the other direction
Ray
Two angles that share a vertex and, therefore, are right next to each other
Adjacent Angles
The longest side of a right triangle that is directly across from the right angle
Hypotenuse
Total number of degrees in a semicircle
180 degrees
A polygon with all equal sides and angles
Regular Polygon