Traditionally the area of a triangle is found using the perpendicular height. In this tutorial, you learn how to find the area of a triangle using 2 side lenghths and the angle in between, through the use of the sine ratio / rule.
In this lesson you learn the proof of sine rule, and how to use it to find unknown sides / angles in a non-right angled triangle, when at least 1 pair of opposite sides/angles are given.
In this tutorial, you learn how to find an unknown side in a right angle triangle, given the angle and one side, using the trigonometric equations and the calculator.