Geometry
Two tracks. Solids first, because they are the ones textbooks flatten into unreadable drawings.
Stereometry
3 / 4 ready01Ready
Axioms
Points, lines and planes — and what they are allowed to do.
02Ready
The Box
Edges, face diagonals, space diagonals and the angles between them.
03Ready
The Pyramid
Apex, height, slant height, and cross-sections you can slide.
04In progress
The Sphere
Great circles, tangent planes and the geometry of the round.
Planimetry
0 / 1 ready01In progress
The Triangle
Centres, heights and the theorems that hold it all together.