How to Determine the Radius of a Cable Tray
- 1). Wrap a tape measure around the circumference of the cable tray and measure the distance in inches. For example, the circumference might be 100 inches.
- 2). Convert the radius to feet by dividing by 12, since a foot contains 12 inches. Now you have a radius of 8.3 feet.
- 3). Divide the circumference by twice the value of Pi to obtain the cable tray's radius in feet. Pi equals 3.14. Completing the exercise, you have 8.3 feet divided by 6.28, or 1.3 feet. This equals 1 foot, 3.6 inches, since converting 0.3 feet to inches is done by multiplying by 12.
