# Trigonometry

## Special right triangles

Learn
Special right triangles intro (part 1)Special right triangles intro (part 2)30-60-90 triangle example problemSpecial right triangles proof (part 1)Special right triangles proof (part 2)Area of a regular hexagonSpecial right triangles review
Practice

## Introduction to the trigonometric ratios

Learn
Hypotenuse, opposite, and adjacentIntro to the trigonometric ratiosTrigonometric ratios in right trianglesTrigonometric ratios in right triangles

## Solving for a side in a right triangle using the trigonometric ratios

Learn
Solving for a side in right triangles with trigonometrySolving for a side in right triangles with trigonometry

## Solving for an angle in a right triangle using the trigonometric ratios

Learn
Intro to inverse trig functions

## Modeling with right triangles

Learn
Right triangle word problemAngles of elevation and depressionRight triangle trigonometry review
Practice

## Trigonometric ratios and similarity

Learn
Triangle similarity & the trigonometric ratiosTrig challenge problem: verify identitiesTrig challenge problem: trig values & side ratios

## Sine and cosine of complementary angles

Learn
Sine & cosine of complementary anglesUsing complementary anglesTrig word problem: complementary angles

## The reciprocal trigonometric ratios

Learn
Reciprocal trig ratiosFinding reciprocal trig ratiosUsing reciprocal trig ratiosTrigonometric ratios review
Practice

#### Quiz 1

Identify your areas for growth in these lessons:

## The law of sines

Learn
Solving for a side with the law of sinesSolving for an angle with the law of sinesProof of the law of sines

## The law of cosines

Learn
Solving for a side with the law of cosinesSolving for an angle with the law of cosinesProof of the law of cosines

## Solving general triangles

Learn
Trig word problem: starsLaws of sines and cosines review

#### Quiz 2

Identify your areas for growth in these lessons:

#### Unit test

Test your understanding of Trigonometry with these 9 questions.