ATAN

Use to give the inverse tangent of an angle.

The arctan is the inverse function of the tangent function. So given a tangent value this function will give you the angle between -90 and 90 degrees. The arctan 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 b and c. Dividing c by b will give us the tangent of C

tan C = c/b

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

=ATAN(c/b)

So using some sample values of b = 32 and c = 16 the formula would be

=ATAN(16/32)

This would return a value 26.57 degrees for the angle C