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@Thuekr
Yeah trigonometry is always right :-)
BUT applied to the real world, things get funky
http://i256.photobucket.com/albums/hh167/edscoble/Photobucket%20Desktop%20-%20Edward%20Scobles%20MacBook%20Pro/6326849846_eba5a1c0da_b_zpsc904dc7c.jpg