You Take the math time machine into the past to save Julius Caesar and fix the calendar, but you miss your time stamp and end up in Alexandria a few years early you wander round before ending up in front of the great library of Alexandra which is guarded by his Sphinx known in mythology for their tricky riddles. When you ask the sphinx what year it is, it refuses to answer unless you solve a math problem this sphinx shows you a right triangle with the base of 8 in the height of 6 which you know has the area of 24 then it tells you that if you can remove some length x off of the 8 side but if you do you must add a rectangle under the 8 side with the height equal to x thus creating a trapezoid how much length must you remove from side 8 so that the trapezoid has the same area as the original triangle x =0does not count.