circle = 6.28318530717958 radian (plane angle)
Try converting from "perigon" to arc minute (minute of arc), arc s (second of arc), centesimal minute, centesimal second, circle, degree (Pi rad / 180), grade, octant, quadrant, rad (radian), revolution, sextant, sign, turn, or any combination of units which equate to "plane angle" and represent plane angle.
perigon = 21,600 arc minute (minute of arc), 1,296,000 arc s (second of arc), 40,000 centesimal minute, 4,000,000 centesimal second, 1 circle, 360 degree (Pi rad / 180), 400 grade, 8 octant, 4 quadrant, 6.28 rad (radian), 1 revolution, 6 sextant, 12 sign, 1 turn.
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