## 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

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