We just recorded the biggest snowfall in the Lehigh Valley ever (over 30 inches) and despite clear roads, we are still having snow days! There are narrow roads in city portions of our area and there is too much snow for busses to make the turn onto some of those roads. This excessive (and unplanned) time off from work gave me time to think and to build something really cool in Desmos Activity Builder. If you haven't tried Desmos Activity Builder out yet and you are a math teacher, you are missing out. This is my 4th lesson built in Desmos Activity Builder.
The lesson focused on tangents to circles. In the past we would look at two big ideas, as illustrated below.
Big Idea #1: Tangents are perpendicular to radii at the point of tangency.
Big Idea #2: Tangent segments to a circle from a common point are congruent.
What does the activity do and what does it look like? I could tell you, but that would ruin the fun of trying it our for yourself. So...here is the link: Tangents to Circles.
My students will be doing this activity in class on Monday (February 1st) and I will post back to this blog with a few comments of how things went. Be sure to return next week.