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Classifying Triangles / Types of Triangles

On these printable worksheets, students will practice identifying and classifying triangles. On some worksheets, they will sort triangles by angle, identifying Acute, Right, and Obtuse triangles. On others they will sort by length of sides, identifying Scalene, Isosceles, and Equilateral triangles.

types of triangles Worksheets

Classifying by Side Lengths:
Equilateral, Scalene, Isosceles

Identify each triangle type by the lengths of its sides.
6th and 7th Grades
Common Core
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Determine which of the pictured triangles are isosceles, equilateral, scalene, and right.
6th and 7th Grades
Cut out the triangle pictures and definitions. Sort them on the chart and glue them to the paper.
4th and 5th Grades
Color the scalene triangles red, the isosceles triangles green, and the equilateral triangles blue.
4th and 5th Grades

Classifying by Angles:
Acute, Obtuse, Right

Tell whether each triangle is acute, obtuse, or right.
4th and 5th Grades
Cut out the triangles at the bottom of the page. Sort them into three groups. Glue them down onto the page.
4th and 5th Grades
Color right triangles red, obtuse blue, and acute green.
4th and 5th Grades
See also:
Angle Worksheets

Print worksheets on classifying, measuring, and drawing angles.

Areas of Triangles

Jump to this page to find worksheets that require pupils to calculate the area of triangles.

Geometry Worksheets

These printables cover a wide-variety of topics, including polygons, circles, area, perimeter, coordinate planes, ordered pairs, lines, points, tessellation, and symmetry.

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Common Core Alignment
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