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Find the length of the hypotenuse of the triangle pictured below. Give your answer accurate to at least 2 decimal places.

412[Graphs generated by this script: initPicture(-3,12+3,-3,12+3);path([[0,0],[12,0],[0,4],[0,0]]);text([0,4/2],"4","left");text([12/2,0],"12","below")]

hypotenuse =