Watch the proof come alive! Students see how dots arrange into triangles and pair up to form rectangles, revealing why T(n) = n(n+1)/2. Students control an 8-phase animated walkthrough with 10 worked examples, an interactive scrubber timeline, and clickable step-by-step panels. Perfect for visual learners who need to SEE why the math works, not just memorize formulas. What's Included:- 10 worked examples with varying values - 8-step animated proof walkthrough per example - Interactive scrubber/t