The cable should be 50 feet.
If you draw the picture, you will see that you have a right triangle.
Let's just use the Pythagorean Theorem to find the hypotenuse (or cable).
30^2 + 40^2 = c^2
2500 = c^2
50 = c
The radius of the circle would be 10.19 I hope this helped!! :)
54 stakes. 12" in a foot, 12x36 = 432, 432/8 = 54
The answer would be 50 and 37.
50-37 = 13
50+37 = 87