Let’s think back to Geometry… …and the special right triangles

Now, let’s apply it to the unit circle… What does “unit circle” really mean? It’s a circle with a radius of 1 unit. What is the equation of the “unit circle”?

Let’s begin with an easy family… What are the coordinates? Now, reflect the triangle to the second quadrant…

What are the coordinates? Now, reflect the triangle to the third quadrant…

What are the coordinates? Now, reflect the triangle to the fourth quadrant…

What are the coordinates?

Now, reflect the triangle to the second quadrant.

Now, reflect the triangle to the third quadrant.

Now, reflect the triangle to the fourth quadrant. What are the coordinates?

Let’s look at another “family” Now, reflect the triangle to the second quadrant

Now, reflect the triangle to the third quadrant What are the coordinates?

Now, reflect the triangle to the fourth quadrant What are the coordinates?