Triangles

Triangles

Triangles

Harmonious Triangles

Golden triangles

little triangles.

Plus 6 triangles, I got a total of 8 triangles

Two obtuse triangles.

Two right triangles.

Why use triangles?

They are congruent triangles.

So two isosceles triangles.

They are congruent triangles.

So you can imagine if I'm gonna use this I need to have some triangles, there's no triangles here right now, but I can construct triangles, and I can construct triangles based on things I know.

We have two right triangles.

OK, these are similar triangles.

So these are congruent triangles.

Which triangles must be similar?

These are definitely similar triangles.

Plus, the two triangles are congruent because of the side side side congruence theorem for triangles.

Then we have two congruent triangles

The four right triangles are congruent.

These are definitely not similar triangles.

Just break it up into triangles.

That these two triangles are symmetric

So these two are congruent triangles

Two scalene triangles with congruent bases.

The two triangles must be scalene.

What do we know about triangles?

And it deals with right triangles.

Remember, I used triangles for potassium.

All of these triangles are 60 60 60 triangles, which tells us and we've proven this earlier on

SO, all congruent triangles, if something if two triangles are congruent they are definitely going to be similar.

Enable this option to show golden triangles.

The triangles are adjacent to each other.

These two triangles would be very different.

You just break it up into triangles.

So four sides give you two triangles

So 4 sides used for two triangles

When we first started studying equilateral triangles

So these two triangles are the similar.

Congruent triangles are a subset of that

Two isosceles triangles with congruent vertex angles.

If that's one of my isosceles triangles.

Because triangles are the only rigid structures.