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Types of Polygons

A polygon is named according to the number of sides it has.
Look at the following polygons.

3 sides 4 sides 5 sides 6 sides

Triangle Quadrilateral Pentagon Hexagon

7 sides 8 sides 9 sides 10 sides

Heptagon Octagon Nonagon Decagon

21 st
Activity Century #Art Integration
Skills

Let us have some fun with straws of different sizes and clay.

First, make a triangle with straws of different sizes and clay.
y What kinds of angles does a triangle have? ___________
y Does the shape of the triangle change if we gently push one
of its sides? ___________

Next, make a rectangular and a square shape.

Square
Rectangle

y What kinds of angles do you see in these shapes? ___________
Now, gently push one of the sides of the rectangle or square.

y What has happened to the angles of the new shape? Are they still right angles?
What types of angles have been formed?

122 Mathematics 4