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raku007
Posts:
5
Registered:
9/12/07


stereometrical problem
Posted:
Oct 4, 2007 10:23 AM


We have a quadrangular pyramid ABCDS where ABCD is the ground of the pyramid and inside the pyramid is a sphere which is tangent to the ground (ABCD) in point P We must prove, that angle APB + angle CPD = 180 degree



