For a right-angled triangle ... 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. Make ...

This means that the unknown angle (𝒂) is 225˚. This can be checked by adding the two angles together to make ... triangle has three equal sides. This is shown by the hatch marks on each side.