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I have two question though they are different in some way

  1. Could any one tell me how to find area of spherical triangle in a easiest way?

  2. How to find the volume of Spherical tetrahedron! which is in $S^3$ embedded in $\mathbb{R}^4$

Thank you for your help.

Myshkin
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  • I would expect the answer to depend on the form in which the triangle and tetrahedron are given. – joriki Mar 19 '13 at 13:08
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    http://arxiv.org/abs/1011.2584 has a formula for the volume based on the dihedral angles of the tetrahedron. For the surface area, you could use the usual spherical excess formulas. – Andrey Sokolov Sep 27 '13 at 03:08

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