Lesson: Finding the Area of a Triangle Using Trigonometry Mathematics • First Year of Secondary School

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In this lesson, we will learn how to find the area of a triangle using the lengths of two sides and the sine of the included angle.

Students will be able to

derive and recall the formula ,
use the formula to calculate the area of a triangle given two of its lengths and an included angle,
calculate unknown lengths or angle measures given the area of a triangle,
calculate areas of parallelograms and other compound shapes using the formula.