Using Trig Ratios to Find Missing Side Lengths

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Learn how to use the trip ratios to find missing side lengths. Do you remember SOHCHATOA ? This is an easy way to remember the trigonometric ratios. Sine equals opposite over hypotenuse, cosine is hypotenuse over adjacent, and Tangent equals opposite over adjacent.
Once you identify which trig ratio should be used finding the side length of the right triangle is straightforward.
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If you solved the last one, that would be helpful, i needed to know how to solve the last one

alexnelsin
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So, do we have to just solve for the 3rd length by the use of the Pythagorean theorem?

onegaimatte
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everytime i have to divide (like shown in 3:02 ) and i type it into my calculator, it always shows me a different answer. maybe im doing somethitn wrong but im not sure? can anyone help? (i have a TI-30Xa *Texas Instruments* calculator ..)

xxingyun