One last triangle area formula is: ½bcsin A, where b and c are two sides and angle A is the angle between them. This formula is related to the cross product, something we will study with vectors. This formula is related to the cross product, something we will study with vectors. The Law Of Sines is something I memorized in a class once, but didn’t internalize: Ok, that’s a neat connection, and maybe we can prove it by drawing some right triangles (of course) and re-arranging terms. But what does it mean? Rather than the Law of Sines, think of the Law of Equal ... There are angles on the outside, too! Definition of an exterior angle. At each vertex of a triangle, an exterior angle of the triangle may be formed by extending ONE SIDE of the triangle. See picture below. Calculating the Angles. We can use equations to represent the measures of the angles described above. Agreat!many!spherical!triangles!can!be!solved!using!these!two!laws,!but!unlike!planar! triangles,!some!require!additional!techniques!knownas!the!supplemental!!Law!of ... Once learned this math can be used in any trade because the math doesn't change. Showing how to use the calculator makes it even better. This book not only contains the pipe fitting math formulas but teaches how to use them. Pipe Fitter's Math Guide was written to provide the math for pipefitters directly. It is about as straightforward as you ... If taper angle to be known then we need to use some trigonometric equations. Taking the above said example, In the above case, if the taper angle to be known, then we need to use tan theta (as we know opposite and adjacent sides).