This angle is equal to this angle.

That angle is equal to this angle.

If we knew that this angle is equal to that angle and that angle is equal to that angle, we'd be done.

So clearly, angle CBE is equal to 180 degrees minus angle DBC angle DBA is equal to 180 degrees minus angle DBC so they are equal to each other!

This angle is equal to this vertical angle, is equal to its vertical angle right over here and that this angle is equal to this angle that is opposite the intersection right over here.

This angle plus this angle is going to be equal to this angle.

Or this angle plus this angle plus this angle is equal to 180.

So, that angle must be equal to that angle there

Is equal to angle DBA.

So that means that this angel, is equal to this angle, is equal to that angle

And this right over here, this little marks says that this angle is equal to this angle is equal to this angle.

And this angle plus that angle plus that angle have to be equal to 180.

Now this angle corresponds to that angle, but they're not equal.

Measure of angle A is equal to measure of angle C.

Then we would know that that angle is equal to that angle.

This y angle is equal to this y angle because it's corresponding.

And we also we make this angle is equal to that angle.

How do we know that this angle is equal to this angle?

So this green angle plus this purple angle is equal to 180.

So, we're just saying that this angle is equal to that angle

I will just say prove angle CBE is equal to angle DBA.

But thats also going on over here, this angle is equal to this angle is equal to this angle. they all have to be 60degrees.

Which means that angle CBE plus angle DBC is equal to 180 degrees.

Let's see, measure of angle A is equal to measure of angle B.

A right angle is an angle that is equal to 90 degrees, or who's measure is equal to 90 degrees.

And isosceles triangle means that that side is equal to that side and that angle is equal to that angle.

So the measure of angle 2 is equal to the measure of angle 3.

Because this angle plus this magenta angle is going to equal the whole circle.

That means that angle 3 plus angle 4 have to be equal to 180.

If that angle is equal to this angle, the best way to think about it is, this angle is also equal to, and you could watch the videos on the angle game that I do.

So we know that angle z plus angle y is also equal to 180 degrees.

So this pink angle theta plus this green angle must be equal to 90 degrees

Measure of angle 1 plus measure of angle 2 have to be equal to 180.

And so this angle right over here is equal to this angle right over here

This angle right over here is going to be equal to that angle over there

So, that angle is equal to that angle and that ABD, which is this angle is congruent to DCA which is that angle over here

The only way that this would be equal to 180, angle 3 plus angle 4, is if angle 4 were a 90 degree angle, and angle 3 were also a 90 degree angle.

If you break it up into triangles, this angle plus that angle plus that angle has to be equal to 180.

If we assume that measure of angle A is equal to measure of angle C, it follows that AB is equal to BC.

Cause we know this angle and this angle are going to be equal to 180 degrees

So then we have this angle plus 90 degrees plus this angle have to equal 180.

I get angle DBA is equal to 180 degrees

It essentially just means the angle measures are equal.

That tells me that the measure of angle AEB is equal to the measure of angle CEB which must be equal to 90 degrees

We just have to remind ourselves that this angle is going to be equal to that angle