Complementary angles are angles which add up to 90 degrees, hence the complementary angle of 15° is 75°
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17 dgree
the simple way to culculate this value is to ist consider the basic trignometric ratio near to 20. Than we come that 30 is near to it and cos30 is equal to 0.866 now for 1 dgree rise or fall the costheta decrese by the factor 0.0009 since cos20 is 10 dgree far frm thrty so multiply 0.0009 by 10 and subtract from 0.866. U wil get answer of cos20
By turning an object, or figure each time, or 90 degrees, four times, you would have turned that object 360 degrees. 360 degrees = one full evolution or full circle.
It equals 285
The answer is... 15 !