ACOS

Use to give the inverse cosine of an angle.

The arccos is the inverse function of the cosine function. So given a cosine value this function will give you the angle between 0 and 180 degrees. The arccos is mainly used to determine the measure of an angle when two sides of a right angled triangle are known.

Here to find the angle C we can work it out if we know the two sides a and b. Dividing a by b will give us the cosine of C

cos C = a/b

So to get the angle in the program the formula would be

=ACOS(a/b)

So using some sample values of a = 27 and b = 30 the formula would be

=ACOS(27/30)

This would return a value 25.84 degrees for the angle C