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Slope is rise divided by run and percent is rise divided by run then multiply by 100 to change to % slope. As a check to your data, (3.2/40)*100 does equal 8%, so it is confirmed correct. You simply have a right triangle with height of 3.2, length of 40, and the length of the hypotenuse needs to be found to answer the question. The solution is sqrt(3.22+402) which is 40.1278 ft.

Q: What is the length measured along the slope and how did you do it if a right triangle has a vertical height of 3.2' a 40' horizontal distance and an 8 percent slope?

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