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hazard1
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can some one tell me what it is ?
hazard1 said:can some one tell me what it is ?
AlephZero said:I wonder if it's an ancient visual aid for teaching trig functions. If you join the holes to the "origin" you get lots of angles with sin, cos and tan equal to ratios of small integers.
That would explain the holes along the circular arcs at all the intersections with the lines "y = 1", "y = 2", etc.
Looking at triangle OAM , why is AM equal to sin40 ∘ ?
Looking at triangle OAB , why is AB equal to 2sin20 ∘ ?
Looking at triangle ABM , why is AM also equal to ABcos20 ∘ which works out as 2sin20 ∘ cos20 ∘
So it looks like the same AM length value can be calculated by using sin40 ∘
and also calculated by using 2sin20 ∘ cos20 ∘
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