This is a small lab of ideas, not a textbook. Our role here is simple: take concepts that usually live in dense paragraphs and equations, and let you see and move them instead — one slider, one curve, one shape at a time.
Each page here is a workbench: pick a shape, drag an angle, choose a bound, and watch the formula respond in real time.
Drag a point around the unit circle and watch sine, cosine and tangent trace themselves out live.
△Choose the number of sides — from a point to a circle — and see perimeter, area, and solid formulas update instantly.
∫Pick a curve and a boundary, and watch the area underneath fill in as the definite integral is computed.
d/dxSlide a point along a curve and watch the tangent line tilt — the derivative, made visible.
x=Work through linear, quadratic, cubic and general polynomial equations — factoring and formulas, side by side.
△Drag a live right triangle and watch a² + b² = c² hold true — plus the history and proof behind it.
∑Arithmetic, Geometric, and Harmonic Progressions — nth term, sums, infinite series, and interactive calculators for each.
⊞Every topic on this site, alphabetically arranged. Search by name or jump to a letter — your index of all things MATH.LAB.