## Create class **Hemisphere**.

- The class has an field **radius** ( r ) which defaults to 1.

- It has property **Radius** for radius.
- Code Examples 範例:

        public double Radius
        {
            get
            {
                return radius;
            }
            set
            {
                . . . 
            }
        }

- The **set** accessor should verify that **radius** is a floating - number greater than 0.0 and less than 12.0.

> Hint: If radius is out of range, you should write this:

        throw new ArgumentOutOfRangeException(nameof(value), value, $"{nameof(value)} must > 0.0 and < 12.0");

- It has methods that calculate **Volume** ($\frac{2}{3}\cdot π\cdot r^3$), **CurvedSurfaceArea** ($2\cdot π\cdot r^2$) and **TotalSurfaceArea** ($3\cdotπ\cdot r^2$) of the hemisphere.
> Hint: use **Math.PI** for π
- - -
### **Write a program to test class Hemisphere**.

- **Test Code Example**:

    Hemisphere h = new Hemisphere(5);

    Console.WriteLine(h.Volume());
    Console.WriteLine(h.CurvedSurfaceArea());
    Console.WriteLine(h.TotalSurfaceArea());