1.

Two systems of rectangular axis have the same origin. If a plane cuts them at distances a,b,c and a',b;c', respectively from the origin, then prove that 1a2+1b2+1c2=1a′2+1b′2+1c′2.

Answer»

Two systems of rectangular axis have the same origin. If a plane cuts them at distances a,b,c and a',b;c', respectively from the origin, then prove that 1a2+1b2+1c2=1a2+1b2+1c2.



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