Formulas and constructions you can drag — not a PDF. Open a figure, then keep it on the board or ask in chat.
A printed handbook is a page of identities. Here each figure is a live construction: drag a point and the measure updates. You do not need an account to read it.
Start with a live topic. Open the figure, keep it on the graphing workbench, or ask the tutor about the same construction.
1
Pick a chapter, then a figure.
2
Move a point. Dependent marks update on the same live board — not a screenshot.
3
Open the graphing workbench to drive it yourself, or chat with a live board about the same figure.