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Types of triangles
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Triangles
have special names based on their side lengths and angle
measures.
Classifying
triangles
by
side
length
When
you classify triangles by their side lengths, you use the words
equilateral
,
isosceles
,
and
scalene
.
Let's
find out what those words
mean!
An
equilateral
triangle
has
three
equal
sides
.
This is an example of an equilateral
triangle.
An
isosceles
triangle
has
two
equal
sides
.
This is an example of an isosceles
triangle.
A
scalene
triangle
has
no
equal
sides
.
This is an example of a scalene
triangle.
Try some practice problems!
Practice now
Scalene, isosceles, and equilateral triangles
Try some practice problems!
Practice now
Acute, obtuse, and right triangles
Try some practice problems!
Practice now
Classify triangles
Related
Skills
Acute, obtuse, and right triangles
Scalene, isosceles, and equilateral triangles
Classify triangles
Videos
(3)
Acute, obtuse, and right triangles
Scalene, isosceles, and equilateral triangles
Classify triangles
Lessons
Types of angles
Measuring angles with a protractor
