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3 names of where you would find an acute angle is: Triangle, cone and a star.
9 over 12 is also 3/4 or 18/24 or 27/36 or 36/48 or 45/60
If 12-ft were equal to 12-yd, then there would be no earthly reason to have two different names for the same unit of length. 1 yd = 3 ft 12 yd = 36 ft 12 ft = 4 yd
12+3(y) 12+ 3(-3) 12 + {3x (-3)} 12+ (-9) 12-9 3
3 - (-12) = 3 + 12 = 15.