Find the Missing Length

Consider the following triangle ABC.

If AC = 15, AB = 20, and BC = 25, and AD is perpendicular to BC, find the length AD.  Try to come up with a few different methods!

We will be talking about right triangles and the Pythagorean Theorem in Session 2.  Please come to the workshop with a favorite proof of Pythagoras in mind, or an activity or approach you use with students when you work with right triangles.


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