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Types of Triangles Song | Classifying Triangles

Skateboards, mountain climbing, billiards… Don't you just love this stuff? That's why NUMBEROCK put it all into this song about types of triangles that is filled with real-world connections. Triangles are all around us, so it is easy to make this song especially relevant to the lives of students. Learn how to classify triangles by their sides (scalene, isosceles, & equilateral) and by the angles (acute, obtuse, & right) in this ridiculously catchy rock song.

Types of Triangles Song 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.

Learn More

This song targets TEKS and Common Core learning standards from both 4th Grade and 5th Grade. Look into the relevant standards here, or dig deeper into Triangles here.

If you are interested in getting ideas on how to plan a robust standards-aligned Triangles lesson, we recommend checking out Instructure's recommendations for common core standards 4.G.2, and 5.G.2 . These pages help break down standard language, lay out the grade-appropriate level of rigor for each concept, and offer a variety of suggestions for activities (lesson seeds) that help students achieve their learning targets.

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