| A | B |
|---|
| acute angle | an angle whose measure is less than 90 degrees |
| adjacent angles | two angles that lie in the same plane, have a common vertex and a common side, but no common interior points |
| adjacent angles | two angles that lie in the same plane, have a common vertex and a common side, but no common interior points |
| angle | formed by two noncollinear rays that have a common endpoint |
| angle bisectors | a ray that divides an angle into two congruent angles |
| area | the number of square units needed to cover a surface |
| bases | two parallel congruent faces of a prism |
| between | location of point M if P, Q, and M are collinear and PM + MQ = PQ |
| circumference | distance around a circle |
| collinear | points on the same line |
| complimentary angles | two angles with measures that have a sum of 90 |
| concave | a line containing a side of a polygon passes through the interior |
| cone | has a circular base and a vertex |
| congruent | when segments have the same measure |
| construction | methods of creating geometric figures without the benefit of measuring tools |
| convex | a line containing a side of a polygon where no points of the line are in the interior |
| coplanar | points that lie on the same plane |
| cylinder | a solid with congruent circular bases in a pair of parallel planes |
| degree | a unit that results from dividing the circumference into 360 parts |
| edges | line segment where faces intersect on a solide |
| face | flat surface of a solid |
| line | made up of points and has no thickness or width |
| linear pair | a pair of adjacent angles with noncommon sides that are opposite rays |
| line segment | a measureable part of a line that consists of two endpoints and all of the points between them |
| midpoint | the point on a segment that divides the segment into two congruent segments |
| obtuse angle | an angle whose measure is more that 90 degrees but less that 180 degrees |
| opposite rays | collinear rays with the same endpoint |
| perimeter | sum of the length of the sides of a polygon |
| perpendicular | lines, segments, or rays that form right angles |
| plane | a flat surface made up of points |
| point | a location |
| polygon | a closed figure whose sides are all segments |
| polyhedron | a solid with all flat surfaces that enclose a single region of space |
| prism | a polyhedron with two parallel congruent faces |
| pyramid | a polyhedron with all faces (except one) intersecting at one vertex |
| ray | part of a line with one enpoint and extends indefinitely in one direction |
| right angle | an angle that measures 90 degrees |
| segment bisector | any segment, line, or plane that intersects a segment at its midpoint |
| sides | the rays of an angle |
| space | a boundless, three-dimensional set of all points |
| sphere | a set of points in space that are a given distance from a given point |
| supplementary angles | two angles with measures that have a some of 180 degrees |
| undefined terms | terms only explained using examples and descriptions |
| vertex | common endpoint of an angle |
| vertical angles | two nonadjacent angles formed by two intersecting lines, segments, or rays |
