Triangles and Their Classification
Classification of Triangles
Triangles can be classified by the number of sides that are congruent.
Equilateral Triangle
A triangle with all three sides congruent is an Equilateral Triangle. All three angles of an equilateral Triangle are congruent.
Isosceles Triangle
A triangle with at least two sides congruent is an Isosceles Triangle. The two angles adjacent to the congruent sides are congruent.
Scalene Triangle
A triangle with no sides congruent is a Scalene Triangle. None of the angles in a Scalene Triangle are congruent.
Triangles can also be classified by the type of angle in the triangle.
Acute Triangle
Acute Triangle
The three interior angles of an acute triangle all measure less than 90 degrees.
Obtuse Triangle
Obtuse Triangle
An obtuse triangle has one obtuse angle.
Right Triangle
Right Triangle
A right triangle has one right angle.