Term | Definition |
Acute Angle | An angle with measure between 0 degrees and 90 degrees. |
Adjacent Angles | Two angles with a common vertex and side but no common interior points. |
Angle | Consists of two different rays that have the same initial point. |
Angle Bisector | A ray that divides an angle into two adjacent angles that are congruent. |
bisect | To divide into two congruent parts. |
collinear points | Points that lie on the same line. |
compass | A construction tool used to draw arcs. |
complementary angles | Two angles whose measures have the sum of 90 degrees. |
congruent segments | Segments with the same length. |
coplanar points | Points, lines, rays, or segments that lie in the same plane. |
intersect | To have one or more points in common. |
line | Exists in one dimension and extends without end in opposite directions. |
linear pair | Two adjacent angles whose non common sides are opposite rays. |
midpoint | A point that bisects a segment into two congruent parts. |
obtuse angle | An angle with measure between 90 degrees and 180 degrees. |
plane | Exists in two dimension and extends in all directions without end. |
point | A location that has no dimension. |
ray | Part of a line that consists of an initial point and all points extending from that point. |
segment | Part of a line that consists of two endpoints and all the points between. |
supplementary angles | Two angles whose measures have the sum of 180 degrees. |
vertical angles | Two angles whose sides form two pair of opposite rays. |
Linear Pair Postulate | If two angles form a linear pair, then they are supplementary. |
Vertical Angles Theorem | Vertical Angles are Congruent. |
theorem | A true statement that follows as a result of other true statements. |
Geometry | The mathematics of the properties, measurement, and relationships of points, lines, angles, surfaces, and solids. |
opposite rays | Two rays that have a common endpoint and form a straight line. |
postulate | A geometry rule that is excepted as true without proof. |
polygon | A closed plane figure with 3 or more line segments called sides and each side intersects exactly two sides. No two sides are collinear. |
convex | A polygon with all its interior angles less than 180°. |
concave | Non-convex polygon. |
equilateral | Polygon with all sides congruent. |
equiangular | Polygon with all angles congruent. |
regular polygon | A convex polygon that is both equilateral and equiangular. |