## Math Songs: Geometry

### Triangle Song

(Sung to the tune of “Here We Go ‘Round the Mulberry Bush”)

Here we go ‘round the triangle, triangle, the triangle

Here we go ‘round the triangle
It’s geometry

Equilateral triangle, triangle, triangle
Equilateral triangle
3 congruent sides

Isosceles triangle, triangle, triangle
Isosceles triangle
2 congruent sides

Scalene Scalene triangle, triangle, triangle
Scalene Scalene triangle
No congruent sides

This-is-a-right triangle, triangle, triangle
This-is-a-right triangle
A right angle it has

Give me my triangle, my triangle
It’s geometry, my dear Watson

### What Makes a Triangle – Math Parody of “What Makes You Beautiful” by One Direction

You’ve got three sides,
That’s less than four,
You’re turning heads when you walk through the door,
Don’t need no curves,
To cover up,
Three sides and vertices are always enough,

All polygons in the room are jealous,
Everyone else loves you,

Angles that light up my world like nothing else,
Their sum is one hundred eighty degrees, I melt,
But when I look at three sides it ain’t hard to tell,
You all know,
Oh oh,
That’s what makes a triangle,
Acute angles are less than ninety,
But if your angle is wide you’re obtuse, you see
Right triangles let you use trigonometry
You all know,
Oh oh,
That’s what makes a triangle,
Oh oh,
That’s what makes a triangle

So c-come on,
We are the same,
To prove congruence,
There are so many ways,
Give it a try,
Use Side-Side-Side,
Or SAS or ASA, you can deci-i-ide,

All polygons in the room are jealous,
Everyone else loves you,

Angles that light up my world like nothing else,
Their sum is one hundred eighty degrees, I melt,
But when I look at three sides it ain’t hard to tell,
You all know,
Oh oh,
That’s what makes a triangle,
Acute angles are less than ninety,
But if your angle is wide you’re obtuse, you see
Right triangles let you use trigonometry
You all know,
Oh oh,
That’s what makes a triangle,
Oh oh,
That’s what makes a triangle

Na Na Na Na Na Na Na Na Na
Na Na Na Na Na Na [x2]

Angles that light up my world like nothing else,
Their sum is one hundred eighty degrees, I melt,
But when I look at three sides it ain’t hard to tell,

You all know,
Oh oh,

Angles that light up my world like nothing else,
Their sum is one hundred eighty degrees, I melt,
But when I look at three sides it ain’t hard to tell,
You all know,
Oh oh,
That’s what makes a triangle,
Acute angles are less than ninety,
But if your angle is wide you’re obtuse, you see
Right triangles let you use trigonometry
You all know,
Oh oh,
That’s what makes a triangle,
Oh oh,
That’s what makes a triangle
Oh oh,

That’s what makes a triangle

### One Hundred Eighty Math Parody of “Call Me Maybe” by Carly Rae Jepsen

I know those triangles well
Just ask me and I will tell
The sum of angles inside
Is one hundred eighty

But polygons with more sides
Many degrees are inside
And now I’m looking for this
But I can find a way.

In my hand I’m holding,
A formula, degrees are showing
Polygons, a way of knowing
Just count those sides and maybe

I take away 2,
And this is crazy,
I multiply by
One Hundred Eighty

It always looks right
There’s no mistaking
When you subtract 2
And times one eighty,

I take away 2,
And this is crazy,
I multiply by
One Hundred Eighty

And all the polygons
Will work the same, see?
So just subtract 2
And times one eighty

Now you’ve discovered the sum,
Maybe you think that you’re done,
But there’s an angle inside
Whose measure you need to find

Just take the angles and sum,
Make an equation with them,
Solve for the missing degree
See, you just found a way

In my hand I’m holding,
A formula, degrees are showing
Polygons, a way of knowing
Just count those sides and maybe

I take away 2,
And this is crazy,
I multiply by
One Hundred Eighty

It always looks right
There’s no mistaking
When you subtract 2
And times one eighty,

I take away 2,
And this is crazy,
I multiply by
One Hundred Eighty

And all the polygons
Will work the same, see?
So just subtract 2
And times one eighty

The sum of exterior an-
gles is 3 sixty.
It is 3 sixty.
It’s always 3 six-ty

The sum of exterior an-
gles is 3 sixty.
It is 3 sixty.
It’s always 3 six-ty

(music)

It always looks right
There’s no mistaking
When you subtract 2
And times one eighty,

I take away 2,
And this is crazy,
I multiply by
One Hundred Eighty

And all the polygons
Will work the same, see?
So just subtract 2
And times one eighty

The sum of exterior an-
gles is 3 sixty.
It is 3 sixty.
It’s always 3 six-ty

The sum of exterior an-
gles is 3 sixty.
And you should know that

So that’s my theory

### The Circle Song

Verse:
A circle is a shape with all points on the circle the same distance from the center point
A radius is a straight line from the center to the circle’s edge
The diameter is a line across the endpoint of a circle that passes through the center point
A circumference is the distance round the circle

Chorus – Repeat Three Times:
Diameter, D, is twice the radius
Radius, R, is half the diameter
Pi is circumference, C, divided by the diameter
Pi is 3.14 approximately
Circumference is pi D or 2 pi R
Area is pi R2