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una piramide e una sfera hanno iscritto
Inviato: 11 ott 2007, 20:34
da timothy6
A pyramid $ ABCDS $ is given (the base is convex quadrilateral). A sphere is inscribed in this pyramid and it is tangent to side ABCD at point P.
Prove that
$ \angle APB + \angle CPD = 180^{o} $
Inviato: 15 ott 2007, 17:39
da timothy6
no ideas at all?? I have one solution but it's horrible and I'll post it after someone else will prove this
Inviato: 04 nov 2007, 14:55
da timothy6
no one could do it?
Inviato: 05 nov 2007, 13:09
da Sepp
timothy6 ha scritto:no ideas at all?? I have one solution but it's horrible and I'll post it after someone else will prove this
If you have one then post it to the Polish Math Olympiad Committee. But hurry up because it is due to 12 Nov!
Inviato: 05 nov 2007, 20:05
da jordan
ci voleva, sei un genio sepp!!!
