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# 3.5 Trigonometry 5

## 1. 3.5 Trigonometry 5

Foundation Year ProgramNUFYP Mathematics

3.5 Trigonometry 5

Joohee Hong

2019-2020

## 2. Lecture Outline

Foundation Year ProgramLecture Outline

• The Law of Sines

• The Law of Cosines

• Harmonic motion

2019-2020

## 3. Introduction

Foundation Year ProgramIntroduction

Triangles are everywhere, and we often

need to find unknown angles or the side

lengths. The Law of Sines and the Law of

Cosines allow us to find those unknown

quantities.

2019-2020

## 4. The Law of Sines

Foundation Year ProgramThe Law of Sines

• The Law of Sines says that in any triangle

the lengths of the sides are proportional to

the sines of the corresponding opposite

angles. That is,

sin