This right angled 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).

An example of a Heronian triangle which is not right angled is the isosceles triangle with sidelengths 5, 5, and 6, whose area is 12.

This triangle is obtained by joining two copies of the right angled triangle with sides 3, 4, and 5 along the sides of length 4.

Let me draw some right angled triangles.

Angled envelope

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

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.

By angled crosses?

One Staple Angled

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.

And then, in 20 minutes, the right angled triangles began to appear on the screens.

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.