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 - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
... [Read Article]
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