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, say it's equilateral like this roadside
And since every angle's less than ninety degrees, an acute triangle it will also be
If you add up every angle, there are one hundred-eighty degrees in a triangle
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
If you add up every angle, there are one hundred-eighty degrees in a triangle
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 the pool balls with a cue, they're equilateral and acute
If you add up every angle, there are one hundred-eighty degrees in a triangle