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Chapter 18
Plane Figures
| vocabulary | definitions |
|---|---|
| Right Angle | An angle that measures 90° |
| Acute Angle | An angle that measures greater than 0° and less than 90° |
| Obtuse Angle | An angle that measures more than 90° and less than 180° |
| Polygon | A closed plane figure with straight sides |
| Triangle | A polygon with 3 sides |
| Quadrilateral | A polygon with 4 sides |
| Pentagon | A polygon with 5 sides |
| Hexagon | A polygon with 6 sides |
| Octagon | A polygon with 8 sides |
| Regular Polygon | A polygon in which all sides are equal length and angles have equal measure |
| Equilateral Triangle | A triangle with 3 equal sides |
| Isosceles Triangle | A triangle with 2 equal sides |
| Scalene Triangle | A triangle with no equal side |
| Trapezoid | A quadrilateral with exactly one pair of parallel sides |
| Venn Diagram | A diagram that shows relationships among sets of things |
| Circle | A closed plane figure made of points that are same distance from the center |
| Center | The point inside the circle that is the same distance from each point of the circle |
| Chord | A line segment that has its endpoints on the circle |
| Diameter | A chord that passes through the center of the circle |
| Radius | A line segment with one endpoint at the center of the circle and the other endpoint on the circle |
| Compass | A tool used to construct circles |
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Central 4th Math
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