This site describes solve-engine as it is on main: 2.43.0, which npm does not have yet. npm installs 2.40.0, so a page may show an answer that version does not give yet.
GEOMETRY_PACKAGE
const GEOMETRY_PACKAGE: IEnginePackage;Defined in: packages/engine/src/packages/geometry/GeometryPackage.ts:20
Area, perimeter and volume of the common shapes (issue #253): area of circle radius 5, volume of cylinder radius 2 height 5, surface area of sphere radius 3. On by default and removable.
Only the measure triggers (area of, perimeter of, circumference of,
volume of, surface area of) are fused phrases; the shape and dimension
words are ordinary identifiers, read in context, so none of them is reserved.
A dimension can carry a length unit, and the answer then takes the power its
measure has: area of circle radius 5 m is in m², a volume in m³ (#638, see
GeometryUnits.ts). Bare numbers answer a plain number, as they always have. A
missing or wrong dimension for a shape is answered with a structured Error.