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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

Equilateral, Isosceles, Scalene  FREE 
Identify each triangle type by the lengths of its sides.
6th and 7th Grades
Equilateral, Isosceles, Scalene Free Geometry Worksheet
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Common Core
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Types of Triangles
Determine which of the pictured triangles are isosceles, equilateral, scalene, and right.
6th and 7th Grades
Types of Triangles Geometry Worksheet
Classify and Color Triangles
Color the scalene triangles red, the isosceles triangles green, and the equilateral triangles blue.
4th and 5th Grades
Classify and Color Triangles Worksheet
Cut and Glue: Equilateral, Isosceles, Scalene
Cut out the triangle pictures and definitions. Sort them on the chart and glue them to the paper.
4th and 5th Grades
Cut and Glue: Equilateral, Isosceles, Scalene Triangles Worksheet

Classifying by Angles:
Acute, Obtuse, Right

Acute, Obtuse, Right
Tell whether each triangle is acute, obtuse, or right.
4th and 5th Grades
Acute, Obtuse, Right Geometry Worksheet
Classify and Color Triangles
Color right triangles red, obtuse blue, and acute green.
4th and 5th Grades
Classify and Color Triangles Worksheet
Cut and Glue: Acute, Right, Obtuse
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
Cut and Glue: Acute, Right, Obtuse Triangles Worksheet
Find the Missing Angle
On this worksheet, two angle measurements are given for each triangle. Students must use their knowledge of geometry to find the missing angles.
3rd through 5th Grades
Find the Missing Angle Triangles Worksheet
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.

Sample Worksheet Images

Types of Triangles Worksheets

Classifying Triangles Worksheets

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