Beyond determining the actual length of the royal cubit in proportion to π/2, this drawing also allows the radius of a circle to be geometrically derived when the length of one-sixth of its circumference is known. This measure, mapped onto a vertical straight line, divided by 11, then multiplied by 7 and 3, gives the actual radius of a circle on which the known measure is repeated 6 times on the semicircle and 12 times on the full circumference. To ensure this measure is multiplied 6 times, the circle’s axis must pass through the midpoint of the given segment.