Now, this triangle right here is an isosceles triangle.

let's say, let me draw another right triangle, that's another right triangle here.

Geometric Right Angle Triangle

This right angled triangle.

There's my right triangle.

And a triangle that has a right angle in it is called a right triangle.

This is a right triangle.

A right triangle (American English) or right angled triangle (British English) is a triangle in which one angle is a right angle (that is, a 90 degree angle).

Let me draw a right triangle.

This is an isosceles triangle, right?

But this forms a right triangle.

Look at this triangle right here.

So this is a right triangle.

So we have a right triangle.

There is my triangle right there.

Let's apply that to this right triangle right here.

So there I have a right triangle.

Let's say I have a right triangle.

So this is called a right triangle.

Because if you think about it, this is a right triangle. This is a right triangle. That has distance 3.

Let's draw an arbitrary triangle right over here. now let's say that is our triangle.

Well, let me draw a right triangle. Whoops.

This triangle on the left or is on the right over here, this triangle says that

Well that's, this is a hypothesis of this right triangle right over here, right?

And we also have the hypotenuse. Right? This is a right triangle right here.

And now, what's the area of just this right triangle right here?

But this angle is a part of this triangle right here, right?

We know this is a right triangle, et cetera.

Because obviously, only a right triangle has a hypotenuse.

Well, it's a part of this triangle right here.

So if we have a triangle, and the triangle has to be a right triangle, which means that one of the three angles in the triangle have to be 90 degrees.

Triangle ABC is a right triangle with AC 7 BC 24 and a right angle at C. So let's just try to draw that.

And now I'm going to draw a right triangle again.

And this is a very typical type of right triangle.

I know this one, and they're in a triangle, right?

But this example, we know that this is right triangle.

So now we're looking at this large right triangle here.

So what's interesting about a 45 45 90 triangle is that it is a right triangle that has this property.

You only have a hypotenuse when you have a right triangle.

I'm looking at the biggest triangle in this diagram right here

Triangle ABC equals triangle A1B1C1.

So this one has a base, this triangle right here if we say this triangle has a base of 4, and this triangle here has a base of 5.

Now it's probably equally obvious that this triangle on the left has the same area as this triangle on the right.

This is the hypotenuse, right here, of our right triangle. So that is equal to 2.

That's almost a right triangle. Now let's say this angle is a.