1    function pi()
2    {
3      let pi = 355 / 113;
4      alert(pi);
5      return pi;
6    }
7    
8    function areaSquare(side)
9    {
10     let area = side * side;
11     alert(area);
12     return area;
13   }
14   
15   function areaCircle(radius)
16   {
17     let area = Math.PI * radius * radius;
18     alert(area);
19     return area;
20   }
21   
22   function areaRectangle(length, height)
23   {
24     let area = length * height;
25     alert(area);
26     return area;
27   }
28   
29   function areaTriangle(base, height)
30   {
31     let area = 0.5 * base * height;
32     alert(area);
33     return area;
34   }
35   
36   function perimeterSquare(side)
37   {
38     let perimeter = side * 4;
39     alert(perimeter);
40     return perimeter;
41   }
42   
43   function perimeterRectangle(length, width)
44   {
45     let perimeter = (2 * length) + (2 * width);
46     alert(perimeter);
47     return perimeter;
48   }
49   
50   function perimeterTriangle(side1, side2, side3)
51   {
52     let perimeter = side1 + side2 + side3;
53     alert(perimeter);
54     return perimeter;
55   }
56   
57   function perimeterCircle(radius)
58   {
59     let perimeter = 2 * Math.PI * radius;
60     alert(perimeter);
61     return perimeter;
62   }
63   
64   function volumeCube(side)
65   {
66     //Note: ** is a shortcut for raising to a power
67     //Alternate: let volume = side * side * side;
68     let volume = side ** 3;
69     alert(volume);
70     return volume;
71   }
72   
73   function volumeRectangularPrism(length, width, height)
74   {
75     let volume = length * width * height;
76     alert(volume);
77     return volume;
78   }
79   
80   function volumeCone(radius, height)
81   {
82     //Note: I’m calling another function here to help.
83     //Alternate: let area = Math.PI * radius * radius;
84     let area = areaCircle(radius);
85     let volume = area * height;
86     alert(volume);
87     return volume;
88   }
89   
90   function volumeSphere(radius)
91   {
92     let volume = 4 / 3 * Math.PI * (radius ** 3);
93     alert(volume);
94     return volume;
95   }
96