Math
240
M. Flashman

Proof without Words #2

The figure below contains information that can be used to explain why the following equation is true:

Give a **written explanation
based on the figure** for the truth of the equation.

[In your explanation be explicit in identifying what in the figure corresponds to arctan(1/2) and arctan(1/3).

What in the figure allows you to identify this sum with the number pi/4?]