Thursday

December 18, 2014

December 18, 2014

Posted by **Sara** on Sunday, January 17, 2010 at 11:08am.

If someone would just explain what to do with a graphing calculator (TI-84), that would mean a lot! thanks

- geometry -
**drwls**, Sunday, January 17, 2010 at 11:20amYou write:

"For example: cos A = .7986, find angle A, The opposite side is 3. The hypotenuse is 5. And the adjacent side is 4"

but for a 3:4:5 triangle, the cosine is 0.8.

I don't have your calculator, but what you need is a cos^-1 or arc cosine key.

If cosA = 0.7986, A = cos^-1 0.7986 = 37.003 degrees.

**Answer this Question**

**Related Questions**

Trig - Given: cos u = 3/5; 0 < u < pi/2 cos v = 5/13; 3pi/2 < v < ...

Math - 1. Write the expression as a function of an acute angle whose measure is ...

math trigg. - which triangles do you use COS SIN or TAN?? You can use these ...

TRIG - what is another form of: sin (A+B) sin (A-B)/ cos^2 A cos^2 B a) cos^2 A...

MATH - 1.)Find the exact solution algebriacally, if possible: (PLEASE SHOW ALL ...

add math - Given sin (x-y)=1/4, sin x cos y=3/5,and tan y=3/2,without using ...

Math sin/cos - On a piece of paper draw and label a right triangle using the ...

Math - 1. Find the angle of smallest positive measure coterminal with an angle ...

Math - 1. Find the angle of smallest positive measure coterminal with an angle ...

precalculus - For each of the following determine whether or not it is an ...