Our
Polygons (Elementary and Middle School Version) Quick Reference Guide explains the following concepts:
- The definition of a polygon
- Classifying polygons according to the number of sides (using words such as triangle and pentagon)
- Classifying polygons as regular or irregular and as concave or convex
- Classifying quadrilaterals using the terms parallelogram, rectangle, rhombus, kite, and trapezoid
- Classifying triangles using the terms scalene triangle, isosceles triangle, equilateral triangle, acute triangle, right triangle, and obtuse triangle
- The Sum of the Measures of the Angles of a Triangle Theorem
- The Isosceles Triangle Theorem and its converse
- The Pythagorean Theorem and its converse
- The formulas we use to find the areas of quadrilaterals, triangles, and circles
