SAM · Roots · leaf
An angle is a position on the dial, and sine and cosine are its shadows on the two axes.
Before this leaf: Functions.
This leaf feeds: Linear algebra, Integration.
Objects you will meet again: the dial, the 3-4-5 triangle.
One row per lesson, in the order the leaf builds up. Each lesson holds its notes, its demos and its challenges on one page. A demo link opens the lesson at that demo.
This leaf is planned. Its lessons are being designed now, and each one appears here when it is built. The strip above shows its planned length.
Linear Algebra already uses a bearing and a rotation matrix borrowed from here; the dial is the most draggable object in the tree.
Every new word from this leaf appears here, with one sentence and the lesson that introduces it.
The sequencing for this leaf is published with its first lessons.