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A student plots a ramp cross-section with horizontal run 9 feet and vertical rise 12 feet. Which calculation correctly finds the ramp length?
9 + 12 = 21 feet, because the ramp covers both horizontal and vertical distance.
sqrt(9^2 + 12^2) = 15 feet, because the ramp is the hypotenuse of the right triangle.
sqrt(15^2 - 12^2) = 9 feet, because the horizontal leg is the longest side.
(9 x 12)/2 = 54 feet, because the ramp length comes from triangle area.
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