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chapter 1
| Question | Answer |
|---|---|
| acute angle | greater than 0 degrees and less than 90 degrees |
| adjacent angle | two angles in same plane with a common vertex and a common interior points |
| angle | figure formed by two rays, or sides |
| angle bisector | a ray that divides any angle into two congruent angles |
| area | number of nonoverlappping square units of a given size that exactly cover the figure |
| base | any side of a figure |
| between | given three point A,B and C,B is between A and C if and only if all three of the points lie on the same linear and AB+BC= AC |
| bisect | to divide into two congruent parts |
| circumference | a circle is the distance around a circle |
| collinear | points that lie on the same line |
| complementary angles | two angles whose measure have a sum of 90 degrees |
| congruent angles | angles that have the same measure |
| congruent segments | segments that have the same lengths |
| construction | a way of creating a figure that is more precise |
| coordinate | a point corresponds to one and only number on the ruler |
| coordinate plane | a plane that is divided into four regions by a horizontal line (x-axis) and a vertical line (y-axis) |
| coplanar | points that lie in the same plane |
| degree | a unit of angle measure; one degree is 1/360 of a circle |
| diameter | segment that passes through the center of the circle and whore endpoints are on the circle |
| distance | between any two points is the absolute value of the difference of the coordinates |
| endpoint | a point at one end of a segment or the starting point of a ray |
| exterior of an angle | set of all points outside the angle |
| height | a segment from a vertex that forms a right angle with a line containing the base |
| hypotenuse | the side across from the right angle that stretches from one leg to the other |
| image | resulting figure |
| interior of an angle | the set of all points between the side of the angle |
| leg | one of the two congruent sides of the isosceles triangles |
| length | the distance between the two endpoints of a segment |
| line | a straight path that has no thickness and extends forever |
| linear pair | pair of adjacent angles whose noncommon sides are opposite rays |
| measure | angles are measured in degrees |
| midpoint | the points that divides a segment into two congruent segment |
| obtuse angle | measure greater than 90 degrees and less than 90 degrees |
| opposite rays | two rays that have a common endpoints and form a line |
| perimeter | sum of the side lengths of the figure |
| pi | the ratio of the circumference of a circle to its diameter (3.14 or 22/7) |
| plane | a flat surface that has no thickness and extends forever |
| point | names a location and has no size |
| postulate (axiom) | a statement that is accepted as true without proof POSTULATE ABOUT POINTS, LINES, AND PLANES HELP DESCRIBE GEOMETRIC PROPERTIES |
| preimage | the original figure |
| radius | a segment whose endpoints are the center of the circle and a point on the circle |
| ray | part of line that starts at an endpoint and extents forever in one directon |
| refection ( flip) | |
| right angles | measure 90 degrees ` |
| rotation(turn) | each point and its image are the same distance from p |
| segment | part of a line consisting of two points and all point between them |
| segment bisector | any ray segment or line that intersects a segment its midpoints |
| straight angle | formed by two opposite rays and measure 180 degrees |
| supplementary angles | two angles whose measures have a sum of 180 degrees |
| transformation | a change in the position, size, or shape of a figure |
| translation ( slide) | which all the points of a figure move the same distance in the same direction |
| undefined term | basic figure |
| vertex | common endpoints |
| vertical angles | two nonadjacent angles formed by two insecting lines |
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