I struggle with the focus on formal two column proof...it has disappeared from a lot of what I do in geometry. I've found myself substituting the spirit of it with claim and evidence. This turns most of the proofs into shorter answers with work to support or statements w/reason.

Added some slice shading: desmos.com/calculator/1kkuy9… #iteachmath #mtbos

I wanted something to help animate polar graphing, showing Θ and how r can be same direction (+) or opp. direction (-), and show how the rotations can be coterminal & beyond the -2pi...2pi range...here's what I got: desmos.com/calculator/d6ehrm… @desmos #iteachmath #MTBoS

In my HS math classes we make lots of use of @GraspableMath , I love how it allows for most anything you can think of following algebraic rules. This is also helpful for my students showing digital work with Algebraic thinking

FWIW with my AP Calc students we used area model division, long division can work but the area model helps track and self check better IMO. (mathrecreation.com/2009/03/d…, youtube.com/watch?v=8cQaRvh-…) #iteachmath

Made @Desmos Geometry tool to show markings on a shape for congruence , right angles, and parallel relationships. Feel free to use as you see fit. Embeds in Activities too. Feedback on quirks / improvements welcome: desmos.com/geometry/v0jtp6k4… #iteachmath #desmosgeometry #mtbos

Triangle Congruence exploration with new geometry tool teacher.desmos.com/activityb… @desmosclassroom Lots of credit to @davidpetro314 @MsBeckerMaths @Audra1475 for earlier versions of content. #iteachmath #mtbos #geometry

Wanted to help calc BC students visualize Euler's Method. Here's my attempt so far: desmos.com/calculator/fn4aeu… #iteachmath #MTBoS #desmosstudio @Desmos

When you hold meetings…plan for it like a good lesson, or at least try to model good teaching

Examples: “Nice shoes” can be “I hadn’t seen those shoes before” or “I like your haircut” can be “did you get a haircut”. Let the student state the value. And play off of that. Don’t tell them their value but help them celebrate their own value.

Noticing (being seen). Another teacher taught me that when greeting a student we don’t need to say anything evaluative.

This is a good webinar. Helps framing the structure in how it all works in CL.

Happy to be a father and be with the man that taught me how to be a father. #happyfathersday to all the dads out there.