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Types of Triangles

Acute Triangle
Acute Triangle

Acute Triangle. more ... A triangle that has all angles less than 90° (90° is a Right Angle) See: Obtuse Triangle. Triangles - Equilateral, Isosceles and Scalene.

Equilateral Triangle
Equilateral Triangle

In geometry, an equilateral triangle is a triangle in which all three sides are equal. In the familiar Euclidean geometry, equilateral triangles are also equiangular; that is, all three internal angles are also congruent to each other and are each 60°.

Isosceles Triangle
Isosceles Triangle

Isosceles Triangle . Two equal sides Two equal angles Scalene Triangle . No equal sides No equal angles . What Type of Angle? Triangles can also have names that tell you what type of angle is inside: Acute Triangle . All angles are less than 90° ...

image: ck12.org
Obtuse Triangle
Obtuse Triangle

Obtuse Triangle. more ... A triangle that has an angle greater than 90° See: Acute Triangle. Triangles - Equilateral, Isosceles and Scalene.

Scalene Triangle
Scalene Triangle

Equilateral, Isosceles and Scalene. There are three special names given to triangles that tell how many sides (or angles) are equal. There can be 3, 2 or no equal sides/angles: