Students will learn what the foci of a hyperbola are, in terms of distance between each focus and the hyperbola. Then students will learn how to derive the focal length formula for an ellipse.

Conclude by giving your students these challenges:

- 2016 Math Kangaroo Levels 7-8 Problem #23 by STEM4all
- Where Can We Visit? by NRICH
- In Particular by NRICH
- 2014 AMC 8, Problem 23
- An Integer Sequence