In the following we deduce the cosine law for a spherical trihedron.
Let be the vertex unitary vectors as shown in the figure.
The cosine of the angle formed by the plane defined by and the plane defined by is:
Now, using the cyclic property of the triple vector product and Lagrange’s formula (http://planetmath.org/TripleCrossProduct), we can write:
|Date of creation||2013-03-22 17:08:13|
|Last modified on||2013-03-22 17:08:13|
|Last modified by||fernsanz (8869)|