Classifying Triangles Worksheets
How do we classify triangles by naming them? Triangles are regular polygons with three sides and three angles. Triangles are classified based on their angles and sides. The measurements of these angles and sides may be different or the same size, there only maybe one distinctive angle; any two angles or sides may be of equal measurements. Based on their angles, triangles are classified as the following four types: Right triangles are those that have at least one angle of 90 degrees. Obtuse triangles are those that have an angle that measures more than 90 degrees but less than 180 degrees. Acute triangles are those that have all the angles of less than 90 degrees. Equiangular triangles are those that have all its angles of the same measurement. Based on their sides, triangles are classified as the following three types: As the name implies, equilateral triangles are those that have all the three sides of the same measurement. Isosceles triangles are those that two sides of equal measurement. Scalene triangles are those that have all three sides of different measurements.

Basic Lesson
Guides students through the classification of triangles by appearance. Classify and Identify the following triangles as isosceles, scalene, or equilateral.
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Intermediate Lesson
Guides students through the classification of triangles based on measures.
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Independent Practice 1
A really great activity for allowing students to understand the concepts of triangle classification. Classify and Identify triangles as isosceles, scalene, right angle, acute angle or equilateral.
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Independent Practice 2
Students classify 20 triangles. The answers can be found below.
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Homework Worksheet
Students are provided with 12 problems to achieve the concepts of Classifying Triangles.
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Ever Hear Of Tom Swifties?
Tom Swifties are sentences that end in an adverb that tells how Tom said something and applies to the meaning of his statement. "The sum of the squares of the two sides of a triangle is equal to the square of the hypotenuse," recited Tom obliquely.