0.70710678118654752440084436210485
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Improve:
If you mean 45 degrees then it equals: Sqrt (2) /2
(which is the exact form of the above approximate form)
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We know that sin @ = h/l is the basic principle of working of sine bar.Differentiating above equation,.. . cos @ . d@ = l.dh - h.dl_________ l*ld@ =tan@(dh/l - dl/l)This indicate that error is a function of tan @ and below 45 degree error is smaller which suddenly increases above 45 degree. because of this reason sine bar is preferred for measuring angle below 45
one over root of 2 or (1/square root of 2) or 1/1.414213562 or 0.707106781
sine 40° = 0.642788
The sine of 75 degrees is about 0.9659
Sine Pari is Latin for "without equal".