Question

If I have a right angled triangle, how do I work out an angle if I have 1 side and also the 90 degree angle?

Answer 1

Having the length of one side and knowing that one angle is `90^@` is not sufficient information to determine the other angle(s).

Explanation:

See diagram below.
Notice that the `color(green)("green"), color(red)("red"),` and `color(blue)("blue")` triangles all have a right angle and one side with a common length, but the other angles are not fixed values.