Polygons Basic 6 Mathematics Lesson Note

What is a Polygon?

A polygon is a closed shape made up of straight lines. The lines are called sides and they connect at points called vertices.

Types of Polygons

• Triangle – 3 sides
• Quadrilateral – 4 sides (square, rectangle, rhombus)
• Pentagon – 5 sides
• Hexagon – 6 sides
• Octagon – 8 sides

Properties of Polygons

• All sides are straight lines
• The shape is completely closed
• No curves or gaps
• Each corner is called a vertex

Regular vs Irregular Polygons

• Regular polygon: All sides and angles are equal
• Irregular polygon: Sides and angles are different

EXERCISES

1. Fill in the blanks:

1. A shape with 5 sides is called a ________
2. A polygon must be ________ (no gaps)
3. The corners of a polygon are called ________
4. A triangle has ________ sides

1. True or False:

1. A circle is a polygon ________
2. All squares are regular polygons ________
3. A hexagon has 6 sides ________
4. Polygons can have curved sides ________

1. Name these polygons:

1. A shape with 4 equal sides and 4 right angles: ________
2. A shape with 8 sides: ________
3. A shape with 3 sides: ________

1. Draw and label:

1. Draw a regular pentagon
2. Draw an irregular quadrilateral
3. Mark the vertices on your shapes

Answers: 

A: 1.pentagon 2.closed 3.vertices 4.three 

B: 1.False 2.True 3.True 4.False

C: 1.square 2.octagon 3.triangle