| A | B |
|---|
| polygon | closed, plane figure with three or more sides |
| triangle | 3 sides, 3 angles totalling 180 degrees |
| scalene triangle | a triangle with all sides different lengths |
| isosceles triangle | triangle with two sides of equal length |
| equilateral triangle | triangle with all sides of equal length |
| acute triangle | triangle where each angle is acute |
| obtuse angle | triangle with one angle is obtuse |
| right triangle | triangle with one angle of 90 degrees |
| quadrilateral | closed figure with four sides and four angles totalling 360 degrees |
| parallelogram | quadrilateral with two pairs of parallel sides |
| rectangle | parallelogram with 4 right angles |
| square | rectangle with four equal sides |
| trapezoid | four sides, one pair of parallel sides |
| pentagon | 5 sides, 5 angles |
| hexagon | 6 sides, 6 angles |
| heptagon | 7 sides, 7 angles |
| octagon | 8 sides, 8 angles |
| nonagon | 9 sides, 9 angles |
| decagon | 10, sides, 10 angles |
| adjacent angles | two angles with a common vertex and a common side |
| complementary angles | two angles totalling 90 degrees |
| supplementary angles | two angles with a measure of 180 degrees |
| perpendicular lines | two lines that intersect to form a right angle |
| parallel lines | two lines on the same plane that do not intersect |
| verticle angles | angles formed by two intersecting lines, opposite angles are equal |
| transversal | a straight line that intersects 2 or more straight lines at different angles |
| polyhedrons | geometric figures which have faces shaped like polygons |
| prisms | have two bases that are parallel and the same shape |
| pyramids | have one base with all triangular sides sharing the same vertex |
| circle | plane geometric figure with all points the same distance from a given point called the center |
| diameter | staight line segment drawn through the center of the circle with two points on the circle as endpoints |
| radius | straight line segment drawn from the center to one point on the circle |
