You will need
  • roulette;
  • - plumb
  • - scientific calculator.
To find the angle of slope, draw a right triangle, the slant line will act as the hypotenuse. To do this, use the plumb Bob, as it always creates with the ground is a right angle. Choose a starting point on your inclined plane or line, and with the help of a plumb line and measuring tape, measure the distance from that point to the earth (or any other horizontal surface such as the floor). If not plumb, just take the load and hang it on the rope. This distance is called the opposite side.
Then measure the distance from the point in which you rested your plummet, to the point where inclined surface rests on the ground (floor). This will be the adjacent side over. If this distance is hard to find, instead find the length of the inclined surface from the starting point to the ground (floor). It will be the hypotenuse. Anyway, in your possession should be at least two numbers are the hypotenuse and one leg or two leg.
If you know the length of the hypotenuse and the length of the opposite sides, calculate the sine (sin), dividing the length of the leg to the length of the hypotenuse. Now, to find the angle itself, using engineering calculator, find the inverse sine (arcsin) of the obtained number. Notice the calculator symbol may be this: sin^(-1) or asin. You will receive the angle value in degrees.
If you are aware of the length of the adjacent sides and the hypotenuse, find the cosine (cos), to do this, divide the length of the leg to the length of the hypotenuse. Take a calculator with a button agso (or acos or cos^-1) and calculate the inverse cosine, which is the desired angle of inclination in degrees.
To measure the angle of inclination at known legs, find the tangent (tg). To do this, divide the tangent to opposite adjacent. Then from that number using a calculator calculate arctg (it can also be denoted atan or tan^-1). The resulting value will be the size of the angle in degrees.