It's a joint of tubes.

They're the same measure and they're supplementary

Punctuation, Connector

Punctuation ,Connector

It's got straight lines.

Let me draw it a little bit neater than that.

Now what else can we figure out?

Main vertical angle

So let me draw some right triangles, let me just draw one right triangle.

And it deals with right triangles.

Let me draw my right triangle just like that.

How do I know it's not 15 or 16?

A very fancy word for a very simple idea.

They are narrower, so we are going to see that they are smaller than right angles.

This angle down here is a vertical angle, that's gonna be a right angle

And since that is a triangle that has a 90 degree angle, it's a right triangle.

I wanted to introduce you to are acute angles, right angles, and obtuse angles.

But this is just general terminology for different types of angles

This is a right angle

35 is our c.

Fine vertical angle

Now the other thing that we know

I think it'll make everything pretty clear.

Well, we could literally just set up a right triangle and then use the Pythagorean theorem.

And that's the Pythagorean theorem.

And the Pythagorean theorem tells us that if we're dealing with a right triangle let me write that down if we're dealing with a right triangle not a wrong triangle if we're dealing with a right triangle, which is a triangle that has a right angle, or a 90 degree angle in it, then the relationship between their sides is this.

A right angle has ninety degrees.

The main vertical shearing angle, in degrees.

An angle of 90 degrees is called a right angle.

Now, you might already realize that what I have drawn here is a right triangle.

So this is a right triangle.

So as I mentioned already, this is a right triangle.

It's a right triangle.

Obviously, this is a right angle

The two lines cross each other at right angles.

This line is a perpendicular bisector of AB, and so we have two right triangles

Maximum angle from vertical

So let's see if we can do that.

(Laughter)

Now, both of these triangles are also isosceles triangles, so their base angles are going to be the same. So that's one base angle, that's the other base angle.

Equilateral Hyperbola by Four Points

So 8, we know that angle EDB is going to be equal to angle FDC

So...3, and then 3...right over there. Oops!

So those two sides are going to be equal or are going to be of length 3, it's got to be a right triangle.

And we need to find the length of a.