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Geometry Basics II
Polygons
Term | Definition |
---|---|
Pentagon | A polygon with five sides |
Hexagon | A polygon with six sides |
Octagon | A polygon with eight sides |
Decagon | A polygon with ten sides |
Regular Polygon | A polygon in which all the sides and angles are equal |
Square | A quadrilateral that has four equal sides and four right angles |
Rectangle | A quadrilateral with four right angles and two pairs of parallel sides. The opposite sides must be equal, but all four sides may not be. |
Parallelogram | A quadrilateral with two pairs of parallel sides |
Rhombus | A quadrilateral that has four equal sides, but no right angles |
Trapezoid | A quadrilateral with exactly one pair of parallel lines |
Equilateral Triangle | A triangle that has three equal sides and three equal angles |
Right Triangle | A triangle in which two sides meet at a ninety-degree angle |
Isosceles Triangle | A triangle that has at least two equal sides and angles |
Scalene Triangle | A triangle in which all three sides have different lengths |
180 degrees | The sum of the angles for any angle |