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 - The Engine Rebuild Kit - by Curtis Von Fange. I always liked engine rebuild kits. They have all the replacement parts for overhauling an engine without going to the store to get gaskets, special measuring tools, or miscellaneous parts. They come neatly packaged, clean and tidy. But it's important not to let that packaging lull you into a false sense of security. The appearance of matching sleeves, pistons, rings, and bearings can cause frustration and agony if not properly measured and installed in a workshop environment. Following c
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