How do you calculate cos value?

Answer 1

In a problem which can be represented by a right angled triangle, the value of the cosine of an angle can be found by dividing the length of the side adjacent to the angle with the length of the hypotenuse, so if the shorter side was 16 units long and the hypotenuse was 25 units long the cosine of the angle between those two lines would be 16/25 = 64/100 = 0.064;these cosines can easily be found on even cheap hand calculators; it is more difficult and rather obsolete to look for them in a book of mathematical tables