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Resolution of the 1st fundamental equation

It is based on the fact that if two arcs have the same sine, then they are congruent or supplemental. So we can write that: sin x = sen a The solution set of this equation will therefore be: Thus we can write that: cos x = cos a x = a + The solution set of this equation will therefore be: Next: Resolution of the 3rd fundamental equation
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Other parts of the sphere

Spherical zone It is the sphere part generated as follows: The spherical zone area is given by: Spherical cap It is the sphere part generated as follows: The spherical cap area is given by: Spherical spindle The spherical spindle is a part of the spherical surface obtained by rotating a semicircle of an angle about its axis: The area of ​​the spherical spindle can be obtained by a simple three-rule: Spherical Wedge Part of the sphere that is obtained by rotating a semicircle around its axis. axis of an angle: Wedge volume can be obtained by a simple three-rule: Next content: Logarithms
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