Sin A and Cos A

**DreadfulGlory** · September 29th 2012, 09:03 PM

Find the exact values of sin A and cos A. Write fractions in lowest terms.

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.

**MarkFL** · September 29th 2012, 09:08 PM

$\sin A=\frac{\text{opposite}}{\text{hypotenuse}}=\frac{ 20}{25}=\frac{4}{5}$

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

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