1.1.2 Spoken text by miss jane

Alright then—so, what exactly does the Pythagorean Theorem do?

The Pythagorean Theorem is a rule that mathematically connects the three side lengths of a right-angled triangle.

To make things easier, let’s give names to the sides of the triangle.

We’ll call this side: leg a.

This side: leg b.

And this one: the hypotenuse, which we’ll call c.

Now, the Pythagorean Theorem tells us mathematically how these three sidelengths are connected in every right-angled triangle.

Meaning, if we know two of the side lengths—let’s say, in this case, we know the length of leg a and the length of leg b—we can use the Pythagorean Theorem to calculate the length of the hypotenuse c, without actually having to measure it.

So what i say here is that it is possible to find out the third sidelength of a rectangular triangle using the first two.