## Foci of Parabolas Exploration

You have to love the Internet and the inspiration you get from other teachers. I put together an investigation based on the tweet below. Inspired by a session at #T3IC last year, we used [...]

## Triangle Musings

My regular geometry students have struggled with the concept of which side measures can form a triangle. I don't know if it's the wording of theorem - the sum of any two sides of a [...]

## Probability Experiments

In my honors precalculus classes, We performed two experiments. The first is from Math MashUp. I believe the second came from a conference I attended long ago. I had to dust off an old Word [...]

## Marginless Domain and Range Cards

I was intrigued by Sarah Carter's Domain and Range Cards on her Math=Love blog. I was afraid I would lose a lot of time having my students cut out the cards, so I made border-less [...]