| A | B |
|---|
| plane figure | a figure that has 2 dimensions |
| side | a line segment that is part of a polygon |
| polygon | a simple closed figure made up of 3 or more line segments |
| regular polygon | a polygon with sides all the same length and angles the same size |
| irregular polygon | a polygon with sides of different lengths and angles that may be of different size |
| equilateral triangle | a triangle that has 3 congruent sides |
| isosceles triangle | a triangle that has 2 congruent sides |
| right triangle | a triangle with one right angle |
| scalene triangle | a triangle with sides of all different lengths |
| vertex | a point common to two sides of a polygon or the edges of a solid figure |
| capital | an uppercase letter |
