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