chapter 1 defenitions
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54 terms
Terms | Definitions |
|---|---|
 udefined terms | A basic figure that is not defined in terms of other figures. athe undefined terms in geometry are point, line, and plane. |
| point | Names a location and has no size. It is reresented by a dot. |
| line | A straight path that has no thickness and extends forever. |
| plane | A flat surface that has no thickness and extends forever. |
| collinear | points that lie on the same line. |
| coplanar | points that lie on the same plane. |
| segment | the part of a line that consisting of two points and all points between them. |
| endpoint | A point at one end of a segment or the starting point of a ray. |
| ray | a part of a line that starts at an end point and extends forever in one direction. |
| opposite rays | two rays that have a common endpoint and form a line. |
| postulate | A statement that is accepted as truewithout proof. |
| coordinate | a point correspond to one and only one number on the ruler. |
| distance | The distance betwen any two points is the absolute value of the difference of the coordinates. |
| length | The distance between a and b is also called length. |
| congruent segments | are segments that have the same length. |
| construction | a way of creating a figure that is more precise. |
| between | two points a and c all three of the points must lie on the same line. |
| midpoint | is the point that bisects the segment into two congruent segments. |
| bisect | divides |
| segment bisector | any ray,segment, or line that intersects a segment at the midpoint. |
| angle | a figure formed by two rays with a common endpoint. |
| vertex | a common endpoint. |
| interior of an angle | the set of all points between the sides of the angle. |
| exterior of an angle | the set of all points outside the angle. |
| measure | an angle usually given in degrees |
| degree | a degree is a certain amount like a right angle is 90°. |
| acute angle | an angle less that 90° |
| right angle | a 90° angle |
| obtuse angle | an angle bigger than 90° |
| straight angle | a 180°angle |
| congruent angles | angles that have tthe same measurment |
| angle bisector | a ray that divides an angle into two congruent angles. |
| adjacent angles | two angles in the same plane with a common vertex and a common side but no common interior pouints. |
| linear point | angles is a pair of adjacent angles whose noncommon sides are opposite rays. |
| complementary angles | two angles whoose sum is 90° |
| supplementary angles | two angles whoose sum is 180° |
| vertical angles | two non adjacent angles formed by two intersecting lines |
| perimeter | the sum of the side lengths of the figure. |
| area | the number of nonoverlapping square units of a given size that exactly cover the figure. |
| base | any side of a triangle |
| height | a segment from a vertex that forms a right angle with a line contaning the base. |
| diameter | a segment that passes through the center of a circle . |
| radius | half of the diameter. |
| circumference | the distance around the circle. |
| pi | 3.141592653589793434 |
| coordinate plane | a plane that is divided into four reregions by horizontallines. |
| legs | the sides that form a right angle. |
| hypotenuse | the right anngle that stretches |
| transformation | a change int position size or shape of a figure. |
| preimage | original figure. |
| image | resulting figure. |
| reflection | flip |
| rotation | turn |
| translation | slide |
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