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Topic: stereometrical problem
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Posts: 5
Registered: 9/12/07
stereometrical problem
Posted: Oct 4, 2007 10:23 AM
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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

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