Question | Answer |
Has no dimensions and is represented by a dot | Point |
A line that consists of two endpoints and all of the points in between | Line Segment |
It has two dimensions and resembles a floor or wall. It extends without end in all directions. | Plane |
Has one dimension and is represented by a line with two arrowheads, but it extends without end | Line |
Points that lie on the same line | Collinear Points |
Points that lie on the same plane | Coplanar Points |
The point or the set of points two or more figures have in common | Intersection |
Consists of one endpoint and goes on in one directions without ending | Ray |
A rule that is accepted without proof | Postulate or Axiom |
The real number or numbers that corresponds to a point | Coordinate |
The absolute value of the difference between two coordinates | Distance |
Line segments that have the same length | Congruent Segments |
The point that divides the segment into two congruent segments | Midpoint |
A point, ray, line, line segment, or plane that intersects the segment at its midpoint | Segment Bisector |
Two different rays with the same endpoint | Angle |
Each ray of an angle | Sides of Angles |
The endpoint of an angle | Vertex of Angles |
The absolute value of the difference between the real numbers measured on a protractor | Measure of Angle |
An angle that measure between 0° and 90° | Acute Angle |
An angle that measure exactly 90° | Right Angle |
An angle that measure between 90° and 180° | Obtuse Angle |
An angle that measures exactly 180° | Straight Angle |
Two or more angles that have the same measure | Congruent Angles |
A ray that divides an angle into two angles that are congruent | Angle Bisector |
The sum of two angles equals 90° | Complementary Angles |
The sum of two angles equals 180° | Supplementary Angles |
Two angles that share a common vertex and side, but have no common interior points | Adjacent Angles |
Two adjacent angle and their common sides are opposite rays | Linear Pair |
Two angles whose sides form two pairs of opposite rays | Vertical Angles |
A closed plane figure formed by three or more line segments and each side intersects two sides one at each endpoint. | Two Properties of Polygons |
The endpoint of each side of a polygon | Vertices of Polygons |
Determined by the number of sides “n-gon” | Naming Polygons |
A polygon that contains no point in the interior of the polygon | Convex Polygon |
A polygon that contains a point in the interior of the polygon | Concave Polygon |
All sides are congruent | Equilateral |
All angles in the interior of the polygon are congruent | Equiangular |
A convex polygon that is both equilateral and equiangular | Regular Polygon |
3-sided polygon | Triangle |
4-sided polygon | Quadrilateral |
5-sided polygon | Pentagon |
6-sided polygon | Hexagon |
7-sided polygon | Heptagon |
8-sided polygon | Octagon |
9-sided polygon | Nonagon |
10-sided polygon | Decagon |
12-sided polygon | Dodecagon |
Distance around a figure | Perimeter |
Distance around a circle | Circumference |
Amount of surface covered by a figure | Area |
A chord that passes through the center of a circle | Diameter |
A segment whose endpoints are the center of the circle and a point on the circle | Radius |