Notes on Polygons by Teacher MJ

Introduction

• Topic: Regular and Irregular Polygons
• Focus on polygons with 5, 6, 8, and 10 sides.

Definition of Polygon

• A polygon is a closed figure made up of line segments (not curves) in a two-dimensional plane.
• Examples of Figures:
  • Figure 1: Not a polygon (curved side)
  • Figure 2: Not a polygon (open figure)
  • Figure 3: Polygon (closed, line segments)

Types of Polygons

Regular Polygons

• All sides equal and all angles are of equal measure.
• Example: Regular Pentagon (5 sides)
  • All sides and angles are equal.
  • Constructed with protractor and ruler.

Irregular Polygons

• Do not have equal sides and angles.
• Example: Irregular Pentagon
  • Sides and angles are not equal.
• Example: Irregular Hexagon
  • Six sides, not equal.

Classification by Number of Sides

5 Sides: Pentagon

• Regular Pentagon:
  • 5 equal sides and angles.
• Irregular Pentagon:
  • Sides and angles are not equal.

6 Sides: Hexagon

• Regular Hexagon:
  • 6 equal sides and angles.
• Irregular Hexagon:
  • Sides and angles are not equal.

8 Sides: Octagon

• Regular Octagon:
  • 8 equal sides and angles.
• Irregular Octagon:
  • Sides and angles are not equal.

10 Sides: Decagon

• Regular Decagon:
  • 10 equal sides and angles.
• Irregular Decagon:
  • Sides and angles are not equal.

Conclusion

• Importance of understanding regular and irregular polygons.
• Encouragement to like, share, and subscribe for more educational content.