Hello, Pat722!

The directions are somewhat fuzzy.

I may have misinterpreted them.

I believe the diagram looks like this:

We have the unit circle with center and radiiCode:E o .: . : . : * * * A. : * o o D * / * | * 1 / *| / | * / @ * * o - - - - o B * P 1 * | * *| * * | * * o * * * C

is tangent to the circle at

Extend to meet extended at

Then: .

Therefore: .