EXERCISES 11.1

1. Explain the formula in the text for angle measure in the Cartesian model.
2. Find the perpendicular line from (2, 3) to t = {(x, A 1 2x + 3v = 5).
3. Find a coordinate function for f = {(x, A I 2x + 3y = 51.

11.2 THE POINCARE DISK MODEL FOR HYPERBOLIC GEOMETRY