1. Write a method which returns the volume of a cube, given the length of one side. A sample call is: double vol = cubeVolume(1.2); 2. Write a method which returns the area of a circle, given its...

1. Write a method which returns the volume of a cube, given the length of one side. A sample call is:

double vol = cubeVolume(1.2);

2. Write a method which returns the area of a circle, given its radius as a parameter. A sample call is:

double a = areaCircle(1.25);

The area of a circle is given by the formula Math.PI * r * r. Though we could use a number such as 3.14, a more accurate value is provided by Math.PI.