Classifications of Triangles
The Equilateral triangleshown on the left has three congruent sides and three congruent angles.
Each angle is 60°.
The Isosceles triangle shown on the left has two equal sides and two equal angles.
The Scalene Triangle has no congruent sides. In other words, each side must have a different length.
The Acute Triangle has three acute angles (an acute angle measures less than 90°).