Function cylinderA

cylinderA(r: number, h: number): number
Calculates the surface area of a cylinder.
Parameters
- r: number
  The radius
- h: number
  The height
Returns number
Example
```
// Returns 471.23889803846896
const area = Chalkboard.geom.cylinderA(5, 10);
```
- Defined in Chalkboard.geom.ts:101