How many types of triangles can you name? No - small triangles, medium triangles, big triangles and extra-big triangles is not what we're looking for here. Nice try though.

4th Grade | Math |

Elementary and Middle School | 4th Grade |

Language | English Language |

So the robber left another of his mysterious clues for the police…

…but this time, there was also a witness. [Sheriff inspecting the clue]

And while this witness has certainly narrowed down the shape of the culprit, the detective

work isn’t over yet.

This would all be pointless if the bank had…oh, we don't know…a security guard, but whatever. [Newspaper headline about the security of the bank]

So we know we're looking for a shape with three sides…and we know shapes with three

sides are called triangles.

But there are actually four different types of these clever shapes.

So the cops round up the usual ne’er-do-wells and…this guy….wait, who let this guy in? [Shapes lined up in a row]

He's clearly not a three-sided…ugh, y'know what, whatever…you can stay.

So let's check out our lineup. [Suspects folder]

First is the equilateral triangle.

He seems pretty regular, right?

And that’s not just because of his fiber intake.

It’s because an equilateral triangle is – yup – equal all around.

Every side has the exact same length --

-- and every angle is sixty degrees.

Whether he's on his feet, standing on his head or lying down, you'll always know when [The triangle in different positions]

you’re looking at an equilateral triangle.

Next up: The Isosceles Triangle.

He may try to fool you into thinking he’s equilateral, and if you’re not careful,

you could fall for his shenanigans.

That’s because while two of his sides and two of his angles are the same, one side is

decidedly different.

All things being equal, the isosceles triangle prefers things a little skewed… [Isosceles triangle intentionally making paintings lopsided]

But the real odd one of the bunch is this guy: The Scalene Triangle.

Like a goth kid at the prom, this triangle does everything it can to be different from [Girl dressed like a goth arrives at the prom]

other triangles out there.

Every side is a different length and every angle a different size.

There’s no telling what this non-conforming shape might do.

We've got our eye on him…

And finally we have –

- no, not him. [Octagon waving]

We don't even know why he's here.

We were just trying to be nice.

Go home, octagon... [Octagon looks unhappy and walks off]

Finally, we have…him.

The Right Triangle.

When you first meet him, you might think he’s kind of a square.

But don’t be fooled.

One of his angles is always ninety-degrees, but the rest of him is as triangular as they

come.

So which one of this quartet of triads has been identified as the Shapetown Stealer?

…Seriously?

See, if you had a security guard, this never would have been an issue… [Witness says it might have been a semicircle]

We're starting a Go Fund Me page for y'all… [Octagon walking away with the bag of money]