2007-10-19 01:57:37 · 3 answers · asked by whittykrw 1 in Science & Mathematics ➔ Engineering
The slope is the Tangent of the angle.
Slope is rise/run, and the % grade is 100 times the slope. So a slope of 1/1 would be a 100% grade, which is indeed a 45 degree angle.
So if you know the degree of the angle, just enter it into your scientific calculator then hit Tangent.
The Tangent of 39 degree angle is:
0.809784
That is the slope, now multiply by 100 to get the % grade.
80.9784 %
2007-10-19 02:09:01 · answer #1 · answered by specail ed 3 · 1⤊ 0⤋
Slope is rise over run, or the Y distance over the X distance. Percentage of this slope is the Y over the X times 100.
2007-10-19 02:01:11 · answer #2 · answered by Warren W- a Mormon engineer 6 · 0⤊ 0⤋
Use the inverse tan function on your calculator then multiply by 100
2007-10-19 02:02:35 · answer #3 · answered by Rivet gun 2 · 1⤊ 0⤋