Triangles all have three angles
Three sides and three vertices
Sum of interior angles
One hundred eighty degrees

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One hundred eighty degrees
Scalene, equilateral, isosceles
Sum of the angles in every triangle
One hundred eighty degrees

Scalene triangles
Are special because it is true
All of their sides are different
Their angles are all different, too

Equilateral triangles
Are regular, as you can tell
All of their sides are equal
All their angles are equal as well

Isosceles triangles
Acquired this beautiful name
Having two sides that are equal
And two angles that are the same

Chorus