Course Content
Classifying Triangles by Sides
There are 3 ways to describe a triangle when you are referring to the sides of the shape. The key thing to know is that a triangle is a polygon with 3 sides. Once you remember that a triangle is a shape with 3 sides and 3 angles that add up to 180; you will note that none of the sides will be equal, 2 of the sides will be equal, or all 3 of the sides will be equal.
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Classifying Triangles by Sides

 

Equilateral Triangles – 3 equal sides

     

Scalene Triangles – All sides are different lengths, no equal sides

             

 

Isosceles Triangles –  2 of the sides are the same length, one side will not be equal as the other 2