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Polygons Vocabulary
Polygons
| Question | Answer |
|---|---|
| acute triangle | A triangle with all angles measures less than 90 degrees. |
| isosceles triangle | A triangle with at least two congruent sides; two side lengths are the same. |
| right triangle | A triangle with one 90 degree angle. |
| scalene triangle | A triangle that has NO congruent sides; all side lengths are different. |
| equilateral triangle | A triangle with three congruent sides; all side lengths have the same measure. |
| obtuse | A triangle with one obtuse angle; one angle measure is greater than 90 degrees. |
| triangle | A three sided polygon. |
| triangle sum theorem | The theorem which states that the angles measures of any triangle must have a sum of 180 degrees; the angles of a triangle add up to 180 degrees. |
| leg | In a right triangle, the legs are the two sides which create the right angle; the perpendicular line segments. |
| hypotenuse | In a right triangle, the side opposite the right angle; the longest side in a right triangle. The side of the triangle that is does not create the right angle. |
| triangle inequality | The rule that says the smallest side length plus the medium side length must have a sum greater than the largest side length. Small + Medium > Large |
| 3 sided shape | triangle |
| 4 sided shape | quadrilateral |
| 5 sided shape | pentagon |
| 6 sided shape | hexagon |
| 7 sided shape | septagon or heptagon |
| 8 sided shape | octagon |
| 9 sided shape | nonagon |
| 10 sided shape | decagon |
| 11 sided shape | hendecagon or an 11-gon |
| 12 sided shape | dodecagon |
| 15 sided shape | pentadecagon |
| Sum of the interior angles of a polygon | (n-2) x 180 where n is the number of sides on the polygon |
| Number of triangles formed when a polygon is divided into triangles using diagonals (triangulation) | n-2 (n is the number of sides) |
| The measure of each interior angle of a regular polygon | Sum of the interior angles / number of sides |
| Triangulate or Triangulation | The process of dividing a polygon into triangles by drawing its diagonals |
| Polygon | A closed plane figure created by three or more line segments that intersect only at their endpoints (vertices) |
| Regular Polygon | A polygon with congruent sides and angles |
| Congruent | Having the same size and shape |
Created by:
theboss1000
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