Discussion
On a scale of chords the chord of 60 degrees equals
Answer: A
Correct answer: the radius of the arc used
The chord of 60 degrees equals the radius, because the chord, the radius to each end and the arc form an equilateral triangle. This is the property the scale is built on: the 60 degree mark is set at the radius, which fixes the scale, and every other chord is stepped off from the same arc.
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