It is extremely difficult to calculate the shape of sheets for a parabolic dish, but it is easy to calculate a form. A step form for a parabolic dish would consist of a rising series of shrinking circles.

For total y height and x radius, p = x^2 / y.

For every three to six inch interval for y, x = sqrt(py). The diameter of each rising, shrinking circle is 2x. For a parabolic dish of 24 inches wide & 12 inches high, p = (24/2)^2 / 12 = 12.

```
```
y
x
x in
x 16ths in
3
6.000
6
0
6
8.485
8
8
9
10.392
10
6
12
12.000
12
0

Formula for the perimeter of a parabolic dish at `EFunda Area and Perimeter of a Parabola`

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