Classifying Triangles

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What does “congruent” mean?

Scalene TriangleScalene triangles have no congruent sides.

Isosceles TriangleIsosceles triangles have two congruent sides (also angles).

Equilateral TriangleEquilateral triangles have three congruent sides (also angles).

Acute TriangleAn acute triangle has three acute angles.

Right TriangleA right triangle has one right angle.

Obtuse TriangleAn obtuse triangle has one obtuse angle.

Classifying TrianglesBy Sides (Equilateral, Isosceles, and Scalene)

By Angles (Obtuse, Right, and Acute)

Writing AnglesJKL J

K L

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