Dave's
Short Trig Course
You should already be familiar with algebra and geometry before
learning trigonometry.
Frequently
Asked Questions About Trigonometry
Q: What is trigonometry?
A: Trigonometry is the study of how the sides and angles of a
triangle are related to each other.
High
School Trigonometry
Ask Dr. Math a trig question or browse the answers he's already
given to other students.
History
and Uses of Trigonometry
My son asked me the other day what in the world he would ever
use trig for. Here are some answers.
SOS Math:
Trigonometry
Trigonometry is the art of doing algebra over the circle. So
it is a mixture of algebra and geometry.
Triangles,
Circles, and Waves (oh my!)
An Overview of Trigonometry by Kenny Felder. This sheet is meant
as a guide to help you review trigonometry.
Trig Help - Trigonometry Online Video Lessons
Visual help with trigonometry, trig functions, right triangles, radians, identities, formulas, and graphing.
Trig
without Tears
How to remember trigonometric identities. I believe it is
much more effective (and, in the long run, much easier) to understand
thoroughly how the trig functions work, memorize half a dozen
formulas, and work out the rest as needed.
Trigonometry
Applications
I am a theoretical physical chemist. Chemists use trigonometry
routinely to interpret spectroscopic probes of molecules and
use them to figure out molecular structures. Without trigonometry
we would know very little about chemistry!
Trigonometry
made easy (Part 1) and (Part
2)
A tooling manufacturer talks about how machined parts can be
designed and made with the help of trigonometry.
Uses
of trigonometry
Knowledge of nearly nothing beyond trigonometry itself is enough
to make clear the nature of some of the applications of
trigonometry to such endeavors as navigation, land surveying,
building, and the like, but that impression is misleading in
that it fails to indicate the nature and enormous variety of
the other scientific applications and other uses of trigonometry.
Webmath Trigonometry
Expressions, solving right triangles.