- 1). Decide on the diameter of the round pen that you desire. A standard size is 60 feet for working young horses. Decide on the amount of space to dedicate to a round pen and measure the ground area diameter with a measuring tape.
- 2). Multiply the round pen diameter by 3.14. This measurement will calculate the circumference of the round pen.
- 3). Divide this total number by the length of the panels for the round pen. This will supply the number of panels that needs to be purchased for a round pen in this circumference.
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