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a2 +b2=c2102 + 152 =c2c=18.03 feet
It is 77.6 feet.
The theoretical mechanical advantage is the length of the ramp divided by its height. 20/2=10.
If the length of the ramp is L feet, then tan(20) = 18/L so that L = 18/tan(20) = 49.45 feet.
a2 + b2 = c2 (10 x 10) + (15 x 15) = (n x n) - do the math. To find the other side (the hypotenuse) you need to square the lengths of both of the known sides, 10 squared is 100 and 15 squared is 225 and add these together. You now have 325, which you find the square root of, this is 18.027756 feet.