Measure the length of the tread and riser, combined. Typically this will be 17 inches or so. Add at least an inch or two for good measure then, assuming all the stairs are the same, multiply by the number of stairs and, in most cases add for one additional riser. This is for straight stairs with no landings or turns. For pie-shaped stairs one needs to measure the longest points for the trad portions.
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cups measure volume , you wish to measure weight. Try 100 ml equivalent , or a tiny bit more. 100ml is just over 3 ounces of liquid equivalent. In theory one ml is the same as 1 gram but the measure is for liquid. (water I think) A teaspoon full is about 5ml/5 grams. Slightly over the 100ml mark is a very rough estimate. A weighing scale really would be better
Firstly make sure that you are in the right angle measurement (e.g. Degrees, Radians or Gradians.) To do this find the button with DRG written in orange above it then press 2nd F and this button and it will move you to the next type of measurement. Do this until you have the correct angle measurement.
Then press 2nd F tan (in orange above it you will see tan^-1) and type in the ratio and then press =.
And there you go.
If you know the center, measure the distance between the center and one point on the circumference. Measure with the opening of a compass and report on a ruler, or use a ruler.
Take the measure of the radius and multiply by 2. Any other indirect way of getting the radius does not constitute a measure but a calculation.
The diameter of a circle enters in two formulas.
Length of Circumference: C=Pi*D (D diameter) ====>D=C/Pi
Area of the disk A=Pi *D^2/4 =====>D=SQRT(4*A/Pi), SQRT is the square root operation.
Angles may be measured in three angles:degree, radian and gradians (grads). tan(45 deg)=1 tan(45 radians)=1.61977 If your problems require angles to be measured in degrees, make sure that the calculator's angle unit is set to degrees. In RUN screen press [SHIFT][MENU] (SetUp) select the angle line and press function key under the tab Deg (should be F1).