Figures and Shapes

A polygon must have the features below:

• no gaps


• straight lines


• 3 or more sides

Here are some polygons:

There are 2 types of polygons, regular polygons and irregular polygons. Regular polygons have all the same sized sides while irregular polygons have different sized sides.

Shapes

Triangle:

3 sides

Types:

• Scalene Triangle
• Acute Triangle
• Obtuse Triangle
• Right Triangle
• Equilateral Triangle
• Isosceles Triangle

Quadrilateral:

4 sides

Types:

• Rectangle
• Square

Parallelogram:

4 sides

Types:

• Rhombus
• Trapezoid

Basic Shapes:

Any amount of sides

Types:

• Pentagon
• Hexagon
• Heptagon
• Octagon
• Nonagon
• Decagon
• Circle

There are many ways to describe a shape, for instance, convex figures go outward and concave figures go inward.

In this lesson, we have learned about shapes and figures, in the next lesson, we will learn about measurement.