Drive a peg into the ground. Form a loop at both ends of a thin rope measuring 5 meters. Slip one looped end of the thin rope over the peg. Put a stick in the other loop and stretch the rope taut. Move the stick in a circle, keeping the rope taut, scoring a line on the ground with the end of the stick.
Instead of a stick, a piece of chalk, or an aerosol can of paint could be used to mark the ground.
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The circumference of a circle with a radius of 5 meters is: about 31.42 meters.
r = 5
78.53981634 meters.
5 m (31.4 / 2 pi)
2*pi*5 (or 2*3.14*5)