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Naming triangles by angles and sides

This math skill teaches how to classify triangles based on their angles and sides. By determining angle types (acute, right, obtuse) and side lengths (equilateral, isosceles, scalene), you can accurately describe a triangle, such as labeling it an acute isosceles triangle.

Learn naming triangles by angles and sides

Teaching Transcript

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To classify a triangle by both angles and sides, we just answer each independently.

All the angles of this triangle are less than 90, so it's an acute triangle

Two sides are the same, so it's an isosceles triangle.

Combining those, we can call it an acute isosceles triangle

Skill Practice

Naming triangles by angles and sides

Test your understanding of naming triangles by angles and sides by practicing it! Work through the below exercises to use it in practice.