Maths 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.
Browse and play everything without an account — signing in is only so your progress is kept.
How a topic goes
- 01
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.
- 02
Problems
Worked one step at a time. Each step asks before it tells, and hands you the one tool it needed.
- 03
Puzzle
No walkthrough. Tap three points, pick the rule that fits the triangle, and find the length in as few moves as you can.
Every length you need is already there.
This is not a test of arithmetic. What it asks is whether you can look at a solid and see which flat triangle is hiding inside it — and which rule that triangle is waiting for.
- AB6
- AC7.21
- CC₁3
- AC₁?