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Pre-Algebra Ch. 11
Pre-Algebra Ch 11
| Term | Definition |
|---|---|
| vertical angles | Two pairs of opposite angles formed by two intersecting lines. The angles formed are congruent. |
| adjacent angles | Two angles that have the same vertex, share a common side, and do not overlap. |
| complementary angles | Two angles are complementary if the sum of their measures is 90 degrees. |
| supplementary angles | Two angles are supplementary if the sum of their measures is 180 degrees. |
| perpendicular lines | Lines that intersect to form a right angle. |
| parallel lines | Two lines in the same plane that do not intersect. |
| transversal | A line that intersects two parallel lines to form eight angles. |
| alternate interior angles | Nonadjacent interior angles found on opposite sides of the transversal. |
| alternate exterior angles | Nonadjacent exterior angles found on opposite sides of the transervsal. |
| corresponding angles | Angles that have the same position on two different parallel lines cut by a transversal. |
| line segment | Part of a line containing two endpoints and all the points between them. |
| triangle | A closed figure having three sides. |
| vertex | Where three of more planes intersect in a point. |
| interior angles | An angle inside a polygon. |
| exterior angles | An angle formed by one side of a triangle and the extension of the adjacent side. |
| acute triange | A triangle containing all acute interior angles. |
| obtuse triangle | A triangle containing one obtuse interior angle. |
| right triangle | A triangle containing one right interior angle. |
| scalene triangle | A triangle with no congruent sides. |
| isosceles triangle | A triangle with at least two congruent sides. |
| equilateral triangle | A triangle with three congruent sides. |
| congruent | Line segments that have the same length, or angles that have the same measure, or figures that have the same size and shape. |
| polygon | A simple closed figure formed by three or more straight line segments. |
| diagonal | A line segment that connects two nonconsecutive vertices. |
| tessellation | A pattern formed by repeating figures that fit together without gaps or overlaps. |
| regular polygon | A polygone that has all sides congruent and all angles congruent. |
| transformation | Movement of a geometric figure. |
| translation | A transformation where a figure is slid form one position to another without being turned. Also called a slide. |
| reflection | A transformation where a figure is flipped over a line. Also called a flip. |
| line of reflection | The line that a figure is flipped over during a reflection. |
| image | Every corresponding point on a figure after its transformation. |
| rotation | A transformation where a figure is turned around a fixed point. Also called a turn. |
| center of rotation | A fixed point around which shapes move in a circular motion to a new position. |
| rotational symmetry | A figure has rotational symmetry if it can be turned less than 360 degrees about its center and still look like the original. |
| dilation | A transformation that alters the size of a figure but not its shape. |
Created by:
msjonesbss
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