Chapter 8.CR, Problem 42CR

To determine

a)

To explain:

The Parallel Postulate.

To determine

b)

To explain:

The two alternatives if assume the parallel postulate to be false.

To determine

c)

To describe:

The geometry models based on each of the alternatives listed in part (b).

To determine

d)

To draw:

The triangle using each of the geometry model listed in part (c).