Function coneA

coneA(r: number, h: number): number
Calculates the surface area of a cone.
Parameters
- r: number
  The radius
- h: number
  The height
Returns number
Example
```
// Returns 254.1601846157631
const area = Chalkboard.geom.coneA(5, 10);
```
- Defined in Chalkboard.geom.ts:51