CK12 - Trigonometry

9.

a.

b. Period= 12.

c. In otherU.S. cities,the daylighthoursdo not vary so greatly. The amplitudeof the graphwouldbe smaller.

Vocabulary

Dependentvariable The inputvariableof a function,usuallydenotedx.

Domain The domainis the set of inputvalues(x) for whicha functionis defined.

A relationin whicheveryelementof the domainis pairedwith exactlyone elementof

the range.

Function

Independentvariable The outputvariableof a function,usuallydenotedy.

PeriodicFunction Any functionthat repeatsregularly.

Range The set of outputor functionvalues(y) for a function.

Relation A pairingbetweenthe itemsin two sets of numbersor data.

Anglesin Triangles

Learningobjectives

A studentwill be able to:

• Categorizetrianglesby their sidesand angles.


• Determinethe measuresof anglesin trianglesusingthe triangleanglesum.


• Determinewhetheror not trianglesare similar.


• Solveproblemsusingsimilartriangles.

Introduction

The wordtrigonometryderivesfromtwo Greekwordsmeaningtriangleandmeasure.As you will learn
throughoutthis chapter, trigonometryinvolvesthe measurementof angles,both in triangles,and in rotation