H Geometry Unit 1
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Created by:
wadelavigne Plus on January 15, 2012
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Description:
Vocabulary for unit 1
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40 terms
Terms | Definitions |
|---|---|
 geometry | the pure mathematics of points and lines and curves and surfaces |
| point | a specific location in space with no size or shape |
| line | an endless collection of points along a straight path |
| plane | (mathematics) an unbounded two-dimensional shape |
| between | When three points lie on a line, you can say that one of them is between the other two. |
| congruent | Having the same size and shape |
| coordinate | a number that identifies a position relative to an axis |
| number line | a line for representing and graphing numbers. Each point on the line corresponds to a number. |
| angle | two rays with a common endpoint |
| adjacent | having a common boundary or edge |
| linear pair | two adjacent angles whose noncommon sides are opposite rays |
| supplementary angles | two angles whose measures have a sum of 180 degrees |
| complementary angles | two angles whose measures have a sum of 90 degrees |
| right angle | the 90 degree angle between two perpendicular lines |
| acute angle | an angle less than 90 degrees but more than 0 degrees |
| obtuse angle | An angle that measures more than 90 degrees but less than 180 degrees |
| straight angle | an angle that measures 180 degrees |
| vertex of an angle | The common endpoint of the rays of an angle |
| angle bisector | a ray that divides an angle into two congruent angles |
| midpoint | a point that divides a segment into two congruent segments |
| perpendicular bisector | a segment, ray, line, or plane that is perpendicular to a segment at its midpoint |
| conjecture | reasoning that involves the formation of conclusions from incomplete evidence |
| perpendicular lines | Two lines that intersect to form right angles |
| centroid | the point of concurrency of the medians of a triangle. |
| circumscribed circle | A circle that goes around a triangle and passes through its vertices. |
| inscribed circle | a circle inside the triangle that touches each side at one point |
| cirumcenter | segments used: perpendicular bisectors notes: center of the circle containing the traingle's vertices |
| incenter | Point of concurrency of the angle bisectors of a triangle |
| median | segment from a vertex to the midpoint of the opposite side |
| dilation | A transformation that changes the size of an object, but not the shape. |
| pre-image | the original figure in a transformation |
| transformation | a change in the size or position of a figure |
| image | The new figure that is produced in a transformation |
| reflection | a transformation of a figure that flips the figure across a line |
| isometry | a transformation in which the preimage and image are congruent |
| rotation | (mathematics) a transformation in which the coordinate axes are rotated by a fixed angle about the origin |
| coordinate plane | A two-dimensional region determined by a pair of axes and that uses numerical values to represent the location of an object. |
| x-axis | the horizontal line on a graph |
| y-axis | the vertical line on a graph |
| ordered pair | A pair of numbers, (x, y), that indicate the position of a point on a Cartesian plane. |
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