A 1 in 40 slope means that for every 40 units of horizontal distance, there is a 1 unit rise. To convert this to degrees, you can use the arctangent function. The formula to convert slope to degrees is arctan(slope) = angle in degrees. Therefore, for a 1 in 40 slope, the angle in degrees would be approximately 1.43 degrees.
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40 minutes is 0.667 degrees.
If you mean points of (1, 5) and (-1, -1) then the slope works out as 3
Step 1: Divide the percentage slope by 100. Step 2: Calculate arctan or tan-1 [=atan() in Excel] of that value to give the angle. Advanced mathematicians use radians to measure angles, and Excel calculates the angle in radians. However, if you need it in degrees, multiply the last answer by 180/pi. On most calculators you will need to ensure that angles are measured in degrees. Thus, if you have a 15% slope, step 1 gives 0.15 and step 2 gives an angle of 0.1489 radians, which is equal to 8.53 degrees (approx).
the complementary angle of 40 degrees is 50 degrees.
Points: (1, -3) and (2, -5) Slope: -2