Geometry · Algebra · PuzzlesMaths you can look at
Every topic comes in three parts: an interactive 3D explainer, a set of worked problems, and a puzzle that makes you find the move yourself. Nothing here needs a calculator.
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- Topics live
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- Steps per topic
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- Lemur
How a topic goes
The same three beats every time, so you always know where you are.
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Explainer
A solid you can turn in your hands. Drag it flat, fill it with cubes, slice it — the formula arrives after you have already seen why.
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Problems
Worked one step at a time. Each step asks before it tells, and hands you the one tool it needed.
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Puzzle
No walkthrough. Tap three points, pick the rule that fits the triangle, and find the length in as few moves as you can.