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Classifying Triangles

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Examples, videos, worksheets, songs and solutions to help Grade 6 students learn how to classify triangles based on sides and angles.

The following figures show how to classify triangles based on sides and angles. Scroll down the page for more examples and solutions.

Classify Triangles

Classify Triangles Based on Sides and Angles
Learn to classify triangles based on sides and angles.

Classifying Triangles Song
Learn to classify triangles based on sides and angles
Isosceles triangles have two equal sides
like this mountain we’re about to climb;
and since one angle’s over ninety degrees,
an obtuse triangle is what we see.
If you add up every angle,
there are one hundred eighty degrees in a triangle.
If the length is equal on every side,
we say it’s equilateral, like this road sign;
and since every angle’s less than 90 degrees,
an acute triangle it will also be.
If skateboard ramps are your scene,
with three different sides they’re called scalene.
That triangle would also be called right
if a ninety degree angle is inside.
There are two ways to classify triangles:
by their sides and their angles,
like sails out on the high seas
can be right or isosceles.
Or look at the foot of this goose;
it’s scalene and obtuse.
When you break pool balls with a cue,
they’re equilateral and acute.

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