Working with the graphs of trigonometric functions Working with trigonometric relationships in degrees Calculating the area of a triangle using trigonometry Using bearings in trigonometry Video ...
It may be necessary to use Pythagoras' theorem and trigonometry to solve a problem ... button on the calculator \(x = 25.4^\circ\). The cosine rule is: \(a^2 = b^2 + c^2 - 2bc \cos{A}\).