| Term | Definition |
|---|
| point | a location |
| line | made up of points and has no thicknessor width |
| plane | flat surface made up of many points |
| colinear | two or more points on the same line |
| coplanar | points that lie on the same plane |
| line segment | has a beginning and an end |
| congruent | when shapes or segments have the same measurement |
| midpoint | this is the point that is exactly between a segment |
| segment bisector | when a segment, line, or plane intersets a segment at its midpoint |
| bisector | to divide into to equal halves |
| ray | Has a starting point but does not end |
| angle | formed when two noncollinear rays that have a common endpoint |
| vertex | the point shared by two rays |
| right angle | angle that measures exactly 90 degrees |
| acute angle | angle that measures greater than 0 and less than 90 degrees |
| obtuse angle | angle that measures greater than 90 but less than 180 degrees |
| angle bisector | when a ray divides an angle into two congruent angles |
| adjacent angles | two angles that have a common vertex, a common side, but no comon interior points |
| vertical angles | two nonadjacent angles form by two intersecting lines. |
| complementary angles | two angles whose measures have a sum of 90 degrees |
| supplementary angles | two angles whose measures have a sum of 180 degrees |
| perpendicular lines | lines that form 90 degree angles ( right angles) |
| polygon | closed figure whose sides are all segments |
| concave | closed figure whose lines cross the interior |
| convex | closed figure whose lines do not cross interior |
| perimeter | sum of all the lengths of its sides ( segments) |
| regular polygon | all sides in a polygon are the same |
Combine with other sets
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