| A | B |
|---|
| vertex | common endpoint of rays forming an angle |
| acute angle | angle measures less than 90* |
| obtuse angle | angle measures between 90* and 180* |
| straight angle | angle measures exactly 180* |
| right angle | angle measures exactly 90* |
| complimentary angles | sum of 2 angles = 90* |
| supplementary angles | sum of 2 angles = 180* |
| polygon | simple closed figure formed by 3 or more line segments |
| closed polygon | when drawn, your pencil ends up where it started |
| congruent | the line segments and angles have the same measure |
| acute triangle | all angles less than 90* |
| obtuse triangle | one angle is greater than 90*, two are less than 90* |
| right triangle | one angle is 90* |
| scalene triangle | no congruent sides |
| isosceles triangle | at least 2 congruent sides |
| equilateral triangle | 3 congruent sides |
| triangle | 3 sides |
| quadrilateral | 4 sides |
| perimeter | distance around a geometeric figure |
| circle | set of points in a plane that are the same distance from a given point |
| center | given point from which all points on a circle are the same distance |
| circumference | distance around a circle |
| diameter | distance across a circle through center |
| radius | distance from center to any point on circle |
| regular polygon | all sides are conguruent and all angles are all congruent |
| reflex angle | angle that is greater than 180* but less that 360* |
| pentagon | 5 sided figure |
| hexagon | 6 sided figure |
| heptagon | 7 sided figure |
| nonagon | 9 sided figure |
| decagon | 10 sided figure |
| degrees in a triangle | 180 |
| angle bisector | cuts an angle into two equal parts |
| area | covering a shape (carpet, tile, grass) |
| vertical angles | 2 angles that are across from each other and are always equal |
| adjacent angles | 2 angles next to each other |
| intersecting lines | 2 lines that intersect |
| parallel lines | 2 lines that never intersect |
| perpendicular lines | 2 lines that intersect and form right angles |
| prism | 3-dimentional shape with 2 bases that are polygons |
| pyramid | 3-dimentional shape with 1 base that is a polygon |
| cone | 3-dimentional shape whose base is a circle |
| cylinder | 3-dimensional shape whose 2 bases are circles |
| volume | what is inside a 3-dimensional shape |
| surface area | area of each side of a 3-dimensional shape |
| pythagorean theorum | A squared plus B squared = C squared in a right triangle |
| congruent | when 2 things are equal in geometry |
| similar | 2 figures whose angles are equal and sides are proportional |
| rotation | object is spun around; it remains same size and shape |
| dilation | size is increase or decreased but the shape of the object remains the same |
| reflection | when an object is "flipped" over a given line or point. Object remains same size and shape |
| translation | when object moves up, down, left,ot right. The object remains the same size and shape. |
| lines of symmetry | When a line is drawn through an object, and the shape of one side = the shape on the other |
