For inside mounted shutters, measure the distance between the jambs or casings on the side (width), then measure the distance from the inside edge of the top jamb/casing to the sill/floor. For outside mounted shutters, measure the same but to the outer edge of the casings.
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Measure the inside width, height and depth from the smallest and largest spots to ensure your treatment fits.
The order of them does not matter at all, as long as the sides are consistently opposite the angles with the corresponding letter (e.g. side "A" is always opposite angle "a").
You also need an equation for y in order to convert to rectangular form.
One square covers 100 square feet, so to cover 1900 square feet of roof you would need 19 squares. However, you also need "starter shingles" and "hip and ridge" shingles, plus you need to have a few extras because of waste from cutting angles. Starter shingles go around the perimeter of the roof as a bottom layer for the first course of shingles. Hip and ridge shingles go, as you might expect, on the hips and ridges. In order to know for sure the exact quantity you would need for the entire roofing job you have to measure all of these areas.
The set of operations those are required to be done on an instrument in order to make it ready for taking observation