# Sin A and Cos A

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• Sep 29th 2012, 09:03 PM
DreadfulGlory
Sin A and Cos A
Find the exact values of sin A and cos A. Write fractions in lowest terms.

http://oi48.tinypic.com/of3x5j.jpg

That is the problem. Is anyone able to explain to me how I find the answer? This trig stuff is really confusing me. You guys have been so helpful to me. Thank you so much.
• Sep 29th 2012, 09:08 PM
MarkFL
Re: Sin A and Cos A
$\sin A=\frac{\text{opposite}}{\text{hypotenuse}}=\frac{ 20}{25}=\frac{4}{5}$

$\cos A=\frac{\text{adjacent}}{\text{hypotenuse}}=\frac{ 15}{25}=\frac{3}{5}$