Function rectangularprismA

rectangularprismA(l: number, w: number, h: number): number
Calculates the surface area of a rectangular prism.
Parameters
- l: number
  The length
- w: number
  The width
- h: number
  The height
Returns number
Example
```
// Returns 220
const area = Chalkboard.geom.rectangularprismA(5, 4, 10);
```
- Defined in Chalkboard.geom.ts:352