Date: Dec 14, 2007 3:17 AM Author: China -->hk Subject: hi,friends(6) Dear friend:

can you help me?

what is the volume of a '3-sphere_pyramid'(that is: with 3 points A,B,C on the surface of a sphere of radius R and the vertex O is the center of the sphere) with angle<OA,OB>=al(alpha),angle<OB,OC>=be(beta),angle<OC,OA>=ga(gamma)? And,how you deduce it out?

As we know the spherical wedge(lune) has the volume: v=2*R^3*theta/3.