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A schematic representation of a theodolite's axes and circles. A gon = 1/400ᵗʰ of a circle = 0.9° (= 1 gradian), 100 gon (or grads) = 90°. Modern theodolites measure angles in rads (1 rad = the distance of the radius, hence 2π rads circumference).
{{Information |Description ={{en|1=A schematic representation of a theodolite's axes and circles.}} |Source =100px |Author =Fred the Oyster<br/>{{Adobe|v}} |Date =201...