Math Terms- Geometry- Angles and Lines
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36 terms
Terms | Definitions |
|---|---|
 triangle | three sides |
| quadrilateral | 4 sides |
| pentagon | 5 sides |
| hexagon | 6 sides |
| heptagon | 7 sides |
| octagon | 8 sides |
| nonagon | 9 sides |
| decagon | 10 sides |
| undecagon | 11 sides |
| dodecagon | 12 sides |
| concave | caved in |
| convex | not caved in |
| perimeter | you add up the lengths of the sides |
| parallel lines | two lines in the same plane that do not intersect |
| perpendicular lines | two lines on different planes which intersect to form right angles |
| skew lines | two lines on different planes which are not parallel but will not intersect |
| parallel planes | planes which do not intersect |
| perpendicular planes | planes which intersect at right angles |
| transversal | a line which crosses any other lines |
| interior angles | angles inbetween the two main lines |
| exterior angles | angles outside the two main lines |
| alternate interior angles | interior angles which are on opposite sides of the transversal. The pair must have one angle from each family. (congruent) |
| alternate exterior angles | exterior angles which are on opposite sides of the transversal. The pair must have one angle from each family. (congruent) |
| corresponding angles | angles which occupy the same position. The pair must have one angle from each family. (congruent) |
| consecutive interior angles | interior angles which are on the same side of the transversal. The pair must have one angle from each family. (supplementary) |
| obtuse angle | an angle which measures more than 90 degrees but less then 180 degrees. |
| complementary angles | two angles whose sum together is 90 degrees |
| adjacent angles | two angles that share a common side between them. |
| right angle | an angle whose measure is exactly 90 degrees. |
| midpoint | the middle point of a line segment which divides it into two equal parts. |
| angle bisector | a ray which divides an angle into two equal angles. |
| supplementary angles | two angles whose sum together is 180 degrees. |
| linear pair | a pair of adjacent angles whose sum is 180. (supplementary) |
| straight angle | an angle whose sum is exactly 180 degrees. |
| vertical angles | opposite angles formed by intersecting lines (congruent) |
| acute | an angle which is greater then 0 degrees but less then 90 degrees. |
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