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Author Archives: Scott Steketee
Soccer Challenges: Angling for a Shot on Goal
With the World Cup in our hemisphere, and the US squad having started out with a win over Ghana, my thoughts turned to the mathematics of soccer. My friend Henri Picciotto has a nice page about the shooting angle, the … Continue reading
Create Parametric Curves Graphically and Kinesthetically
In this guest post, Nate Burchell describes a sketch he uses with his students to explore parametric functions. In this process students work entirely in a graphical world, manipulating graphs directly rather than by way of equations. (Nate teaches in … Continue reading
Sketchpad Explorer Featured in Mathematics Teacher
The May issue of Mathematics Teacher (MT) has a Technology Tips article on HighLeverage iPad Apps for the Mathematics Classroom by Ayanna Perry, Emily Thrasher, and HollyLynne Lee of North Carolina State University. They explain how to transfer files to … Continue reading
Understand the Sine Function by Dancing It
In Where Mathematics Comes From, cognitive scientists George Lakoff and Rafael Nuñez assert that our understanding of abstract mathematical concepts relies upon our sensorymotor experiences: “For the most part, human beings conceptualize abstract concepts in concrete terms, using ideas and … Continue reading
Iteration in the Complex Plane
The cover story of the April 2014 issue of Mathematics Teacher is on “Iteration in the Complex Plane”, by Robin S. O’Dell. It sounds like pretty advanced mathematics, but is surprisingly accessible with The Geometer’s Sketchpad. It’s all based on … Continue reading
π Day 2014
π Day has always been a special day for me, from my earliest days. In fact, I’ve never figured out whether I was so eager to celebrate my first π Day that I jumped the gun and sent my mom … Continue reading
Discovering the Angle Sum and Difference Identities
In my Advanced Methods class at Penn’s Graduate School of Education, my students are working in groups to create shared lesson plans using an inquiry approach. For a number of reasons it can be challenging for these preservice teachers to … Continue reading
Discovery by Dragging
A few days ago I led a webinar on the Common Core and Sketchpad for Sketchpad beginners, and I showed four Sketchpad activities aligned with both the Content Standards and the Standards for Mathematical Practice. I mixed it up a … Continue reading
Aligning Objects in Sketchpad
I recently got a question from a question from a user about how to line up text objects. The question was both about lining up objects on a page, and about lining them up from one page to the next, … Continue reading
The Wavy Wavy Bridge
http://www.youtube.com/watch?v=acyaO4RxIHc”
At the 2013 Baltimore Regional NCTM Meeting, I gave a presentation on Picturing Functions and Functions of Pictures. In the description of my presentation I’d promised to show how to use Sketchpad to create special effects, so when it came … Continue reading