Sine of the Times https://validator.w3.org/feed/docs/rss2.html The Expanding Circle Construction Tweaking the Expanding Circle Construction Constructing the Pi-Petal Rose A Plethora of Hyperbola Constructions A New Twist on Arranging Addends Protect the Sheep Race to the Burning Tent Introducing Web Sketchpad at the 2021 NCTM Annual Meeting Coding Up a Storm Dissecting Rectangles Into Squares Symmetry Challenges Eigenvectors of 2 x 2 Matrices: A Geometric Exploration Injecting Surprise Into the Triangle Midline Theorem An Equivalent Fractions Game Visualizing a Dynamic Triangle A New Fractal Construction A Double Spiral from David Henderson The Dog Leash Investigation A Transformations Approach to Complex Numbers Teaching with Web Sketchpad Collaborating on an Extension to a Little-Known Theorem Cartesian and Polar Graphs Introducing Dynagraphs Algebra Cross Number Puzzles Cross Number Puzzles Exploring Multiples on a Dynamic Number Grid Adding and Subtracting on a Dynamic Number Chart Learn to Multiply Like No Bunny’s Business A Quartet of Ellipse Constructions Innovative Approaches to Computer-Based Assessment, Part Three A Double Dissection from The New York Times Dilation Games: Assessment That’s Fun The Return of the Odometer Revisiting the Hundred Chart A Trio of Parabola Constructions The Folded Circle Construction A Triple Number Line Model for Visualizing Solutions to Equations Catching the Vibe Some Triangle Shearing Investigations Constructing Rectangles with Constant Perimeter and Constant Area A Hidden Polygons Puzzle Exploring a Perimeter-Area Relationship Virtual Cuisenaire Rods Dynagraphs of Linear Functions A Compendium of Elementary Web Sketchpad Activities Arranging Addends Puzzles Revisited Exploring Triangle Area with Custom-Built Tools Constructing an Ellipse with Web Sketchpad Tools Putting the Power of a Point Theorem to Work Catching Up with New Web Sketchpad Functionality