Lesson 4: Classifying Polygons CE 2015
Algebra Readiness (Pre-Algebra) B Unit 2: Geometry
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In this lesson, you will learn about classifying polygons. Polygons are closed figures with straight sides. By examining their sides and angles, you can determine what type of polygon they are.
To classify a polygon, you need to consider the number of sides and angles it has. Here are some common types of polygons:
1. Triangle: A triangle has three sides and three angles. The sum of its angles is always 180 degrees.
2. Quadrilateral: A quadrilateral has four sides and four angles. The sum of its angles is always 360 degrees.
3. Pentagon: A pentagon has five sides and five angles. The sum of its angles is always 540 degrees.
4. Hexagon: A hexagon has six sides and six angles. The sum of its angles is always 720 degrees.
5. Heptagon: A heptagon has seven sides and seven angles. The sum of its angles is always 900 degrees.
6. Octagon: An octagon has eight sides and eight angles. The sum of its angles is always 1080 degrees.
To classify a polygon, count the number of sides it has and compare it to the above types. Then, check the sum of its angles. If the sum matches the pattern, you can identify the polygon.
For example, if a polygon has six sides and the sum of its angles is 720 degrees, it is a hexagon.
Remember to always check both the number of sides and the sum of angles to classify a polygon accurately.