


Mrs. Brenda Overholt
Math Department
Franklin County High School
700 Tanyard Road
Rocky Mount, Virginia 24151


Choose a
Trigonometry Function
in a
Right
Triangle



The web pages of this lesson are a review and practice of the introductory
lesson you've had on using trigonometry to solve for unknowns in a right
triangle. This review and practice will help you choose the correct
trigonometry function and use it properly in a trig equation to solve for
unknowns in a right triangle.

First you'll choose "where to stand" in the right
triangle based on the angles you are given.

Second, you'll chose the function based on the two
sides you want to have involved in your math problem:

a side you know and a side you need to know

or if you are looking for an angle, you'll have two
sides you know

Third, put the results of the above choices into
the formula for a trig equation.
Complete the following sections IN ORDER to increase your trig skills (just
scroll on down or click REVIEW):

review

examples

practice in choosing where to stand

practice in choosing the correct trig function

put it all together: practice in choosing the trig equation
If you are using Internet Explorer, you should be hearing a midi file
automatically. Netscape users will need to click here.
Do you know the title of the movie that gave us this music and how it relates
to trigonometry? Think back to the introduction to trig you've heard. 


REVIEW


Instructions
for all pages: Read the examples, but be
sure to click on any
symbols you see! On
some pages, you'll need to answer multiple choice questions also. 

The trigonometry you are using is for right triangles only.
You have your choice of two memory devices to help you with the trig ratios:
What does OHAHOA mean? 
How does SOHCAHTOA sound?



You also must know the where the opposite and adjacent legs and the
hypotenuse are located. Here's a reminder:


If you move to the other acute angle, then the opposite and adjacent
switch places, but the hypotenuse stays across from the right angle.
See what happens when you move to the other acute angle. 

Next: Examples
[ tutorial  examples  standing
choice  function choice  equation
]




brenda.overholt@frco.k12.va.us
August, 2004
