For a right-angled triangle, follow these steps to calculate an angle \(Ɵ\), when two sides are given: Note that scientific calculators need to be used for trigonometry and should be in degrees mode.

The Greek letter, Ɵ (theta) is often used as a symbol for an unknown angle. For a right-angled triangle, follow these steps to calculate the length of a side, \(x\), when another side and an ...