These lessons help Grade 6 students learn how to classify triangles based on sides and angles.

**Related Pages**

Types Of Triangles

Special Right Triangles

Area Of Triangles

More Geometry Lessons

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

Learn to classify triangles based on sides and angles.

**Classifying Triangles Song**

Learn to classify triangles based on sides and angles.

Lyrics:

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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