| A | B |
|---|
| supplementary angles | add together to 180 degrees |
| complementary angles | add together to 90 degrees |
| geometry | study of points, lines, and planes |
| point | a location in space; a dot |
| line | a set of many points; does not stop |
| plane | two dimensional flat surface |
| collinnear | points on the same line |
| ray | set of points that is part of a line |
| angle | a figure made up to two sides or rays, with a common endpoint |
| vertex | the point common to both sides of an angle |
| bisect | to divide into two equal parts |
| degree | a unit of angle measure |
| protractor | a tool used to draw or measure angles |
| acute angle | angle whose measure is less than 90 degrees |
| right angle | an angle whose measure is 90 degrees |
| obtuse angle | an angle whose measure is more than 90 degrees, but less than 180 degrees |
| straight angle | an angle whose measure is 180 degrees |
| perpendicular lines | lines that form a right angle |
| vertical angles | angles that have a common vertex and whose sides are formed by the same lines |
| conditional | "If..then..." statement |
| hypothesis | "If" to the "then" |
| conclusion | "then" to the "." |
| converse | hypothesis and conclusion are switched |
| parallel lines | lines in the same plane that never meet |
| coplanar | lines in the same plane |
