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Polygons Vocab.
Polygons and Quadrilaterals vocabulary (Geometry - Mrs. Davis)
| term | definition |
|---|---|
| acute angle | angle less than ninety degrees |
| acute triangle | triangle with all angles less than ninety degrees |
| angle | two rays with a common endpoint |
| complementary | adjective describing two angles whose sum is ninety degrees |
| congruent | adjective describing figures with the same shape and size |
| decagon | ten-sided polygon |
| degree | unit of measure for angles (the most common) |
| dilation | a type of transformation: the process of reducing or enlarging a figure |
| inductive reasoning | a rule based on a pattern of several examples |
| deductive reasoning | reasoning in which the conclusion is reached from previously known facts |
| equilateral | all sides of a figure are congruent |
| heptagon | seven-sided polygon |
| hexagon | six-sided polygon |
| indirect measurement | Indirect measurement is a technique that uses proportions to find a measurement when direct measurement is not possible. |
| inscribed polygon | a polygon whose vertices rest on the circle |
| isosceles | adjective for a polygon with two congruent sides |
| line of symmetry | the fold line between two halves that mirror each other |
| line symmetry | figures that match exactly when folded in half have line symmetry |
| nonagon | nine-sided polygon |
| obtuse angle | an angle measuring more than ninety degrees but less than 180 degrees |
| obtuse triangle | a triangle containing one obtuse angle |
| octagon | eight-sided polygon |
| pentagon | five-sided polygon |
| polygon | a simple closed figure formed by three or more line segments |
| simple | adjective meaning that line segments do not cross each other |
| protractor | a tool used to measure angles |
| quadrilateral | four-sided polygon |
| reflection | a mirror image of a figure across a line of symmetry |
| regular polygon | a polygon with all sides congruent and all angles congruent |
| rhombus | an equilateral quadrilateral |
| right angle | an angle measuring exactly ninety degrees |
| right triangle | a triangle containing a ninety degree angle |
| scalene | adjective for a triangle with three unequal sides |
| similar | adjective for polygons having corresponding angles congruent and corresponding sides in porportion |
| straight angle | angle containing 180 degrees |
| supplementary | adjective for two angles whose sum is exactly 180 degrees. |
| tessellation | a repetitive pattern of polygons that fit together with no overlaps or gaps |
| transversal | a line that intersects parallel lines |
| trapezoid | a quadrilateral with exactly one pair of parallel sides |
| triangle | a three-sided polygon |
| vertex | the common endpoint where line segments or rays meet forming an angle |
| translation | one type of transformation where a figure is slid vertically, horizontally, or both |
Created by:
DDavis
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