| Term | Definition |
|---|
| arc | Part of a circle connecting two points on the circle |
| adjacent angles | Two angles that share a common vertex and side but no interior points |
| chord | A line segment, a straight line connecting two points on a circle |
| acute triangle | A triangle in which all interior angles are acute |
| congruent | Having the same size and shape |
| central angle | An angle whose vertex is the center of a circle |
| diameter | A chord that goes through the center of a circle |
| midpoint | The point in the middle of a line segment |
| geometry | The study of shapes |
| isosceles triangle | A triangle in which two sides are congruent |
| radius | The distance from the center of a circle to a point on the circle |
| right triangle | A triangle with one right angle |
| rhombus | A parallelogram with congruent sides |
| regular polygon | A polygon in which all sides are congruent |
| rectangle | A parallelogram with four right angles |
| equilateral triangle | A triangle in which all sides are congruent |
| obtuse triangle | A triangle with one obtuse angle |
| protractor | An instrument used to measure angles in degrees |
| polygon | A closed plane figure formed by three or more line segments and line segments ONLY |
| square | A rectangle with four equal sides |
| sector | The area inside two radii and arc |
| trapezoid | A quadrilateral with one pair of parallel lines |
| vertical angles | Two angles that share a vertex, intersect, and share no common sides. They are always congruent |
| circle | The set of all points in a plane that are the same distance from a given point called the center |
Combine with other sets
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