Well I'm considerably more than 15 years out of highschool, but I've managed to remember a trick we learned. It's a mnemonic- SOH CAH TOA. In those pre-PC (by that I mean politically correct) days, we pretended they were words in an indian language.
SOH stands for Sine = Opposite over Hypotenuse. CAH is for Cosine = Adjacent over Hypotenuse. TOA stands for Tangent = Opposite over Adjacent.
Depending on which two of the three lengths you happen to have- in this case you have the Opposite (4) and the Adjacent (12)- you divide the 4 by the 12 and take the result to your handy Tangent Table (we have ours hanging over the mantle) to get the angle you need, which is what other posters have already done...
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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