Class 21

Friday, February 27

Today’s Discussion Topics

Go over discussion topics from last time.

Today’s New Topics

Saccheri and Lambert Quadrilaterals
Theorem 4.8.10 presented by Andrea
Theorem 4.8.11 presented by Rafael

Tonight’s Homework

Read Sections 4.8 and 4.9
Do Exercises 4.8 # 3, 9
Discussion topics for next time: What does Aristotle’s Theorem say? What does the Universal Hyperbolic Theorem say?
Happy Spring Break!