| A | B |
|---|
| acute angle | any angle whose measure is greater than 0º but less than 90º |
| acute triangle | any triangle whose angles are all less than 90º |
| angle bisector | any ray, line or segment that divides an angle into two equal angles |
| angle | two rays that share a common endpoint |
| approximate | to come close to a value |
| arc of a circle | two points on a circle and the continuous part of the circle between the two points |
| central angle | an angle whith its vertex at the center of the circle and its sides passing through the endpoints of the arc |
| chord | a line segment whose endpoints lie on the circle |
| circle | the set of all points in a plane that are equidistant from a given point on the plane |
| classify | to determine what something is |
| collinear | on the same line |
| concave | a polygon in which one or more diagonals crosses outside the polygon |
| complementary angles | any two angles whose angle measures add up to 90) |
| cone | 3-dimensional object with a circular base |
| congruent | equal in measure |
| coplaner | on the same plane |
| consectutive angles | two angles of a polygon that are seperated by only one side |
| consecutive sides | two sides of a polygon that are joined together |
| convex | polygons with all diagonals inside the polygon |
| corresponding | in the same place or location |
| counter example | an example that shows a statement to be false |
| cylinder | a 3-dimensional object that has 2 congruent circles as bases |
| decagon | ten sided polygon |
| definition | a statement that clarifies or explains a word or phrase |
| degree | the unit of measure used for angles and rotations |
| diagonal | a line segment in a polygon that connects two non-consecutive verticies |
| diameter | a line segment containing the center of a circle with its endpoints on the circle |
| differentiae | to seperate or classify based on differences |
| dodecagon | twelve sided polygon |
| endpoints | the ends of a line segment |
| equiangular polygon | any polygon whose angles are all equal in measure |
| equidistant | the same distance |
| equilateral polygon | any polygon whose sides are all equal in length |
| equilateral triangle | a triangle with all three sides equal in length |
| hemisphere | 1/2 of a sphere |
| heptagon | seven sided polygon |
| hexagon | six sided polyon |
| isometric drawing | a w-dimensional drawing that shows three sides of an object in one view |
| isosceles triangle | a triangle with two sides equal in length |
| linear pair | two angles that share a vertex and a common side whose angle measures add up to 180º |
| major arc | any arc whose central angle is greater than 180º |
| midpoint | any point on a line segment that is equidistant from the two endpoints |
| minor arc | any arc whose central angle is less than 180º |
| n-gon | the name of any polygon having more than ten sides |
| nonagon | nine sided polygon |
| obtuse angle | any angle whose measure is greater than 90º but less than 180º |
| obtuse t5riangle | any triangle that has an obtuse angle |
| octagon | eight sided polygon |
| parallelogram | a quadrelateral with two pairs of parallel sides |
| pentagon | five sided polygon |
| pont of tangency | the point where the tangent line touches the circle |
| polygon | closed figured in a plane formed by connecting line segments at their endpoints and each segment connecting to exactly two others |
| prism | 3-dimensional object with bases that are congurent parallel polygons |
| pyramid | 3-dimensional object with only one base and polygons for sides |
| quadrilateral | four sided polygon |
| radius | a segment from the center point of a circle to the edge of the circle |
| rectangle | a quadrilateral that is a parallelogram with all four angles congruent |
| regular polygon | an equiangular, equilateral polygon |
| rhombus | a quadrilateral that is an equilateral parallelogram |
| right angle | any angle whose measure is exactly 90º |
| scalene triangle | any triangle with no sides equal |
| semi circle | an arc of a circle whose endpoints are the endpoints of a diameter |
| sides | the rays of an angle or the line segments of a polygon |
| segment | any two given points and the collection of points between them |
| space | the set of all points |
| sphere | the set of all poins in space that are equidistant from a given point |
| square | a quadrilateral that is both equilateral an equiangular |
| supplementary angles | two angles whose measures add up to 180º |
| tangent | a line that intersects a circle in exactly one point |
| test | to check |
| trapezoid | a quadrilateral with exactly one pair of parallel sides |
| triangle | three sided polygon |
| undecagon | eleven sided polygon |
| vertex | the point of intersection of two rays that form an angle |
| vertical angles | angles formed by two intersecting lines. They share a common vertex but no common sides |
