Classify Triangles Lesson
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A triangle has 3 sides and 3 angles. The sum of the measures of the angles of any triangle always equals 180 degrees.
Let's take a look at classifying triangles.
You can classify triangles by their sides.
Equilateral triangle
Has 3 sides that are the same length.
Isosceles triangle
Has at least 2 sides that are the same length.
Scalene triangle
Has no sides that are the same length.
You can also classify triangles by their angles.
Right triangle
Has 1 angle that is a right angle (90 degrees).
Acute triangle
Has all 3 angles that are acute angle (less than 90 degrees).
Has 1 angle that is an obtuse angle (greater than 90 degrees).
Classify the triangle by its sides and angle.
Reason: The triangle has no sides that are the same length.
Reason: The triangle has 1 angle that is a right angle (90 degrees).
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Created by Nicole Freebern Copyright © 2001-06 Oswego City School District
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Let's take a look at classifying
triangles.
