Lesson: Finding the Area of a Triangle Using Trigonometry Mathematics

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.

Lesson Plan

Objectives

Students will be able to

  • derive and recall the formula 𝐴=12π‘Žπ‘πΆsin,
  • use the formula 𝐴=12π‘Žπ‘πΆsin 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.

Prerequisites

Students should already be familiar with

  • right triangle trigonometry.

Exclusions

Students will not cover

  • the law of sines,
  • the law of cosines.

Lesson Video

Video Thumbnail
14:12

Lesson Explainer

Sample Question Videos

  • 01:33
  • 01:15
  • 01:44

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