Q15Short 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, prove that 1 1 1 1 1 1 + 2+ 2= 2+ 2+ 2 . a b c a′ b′ c′
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, prove that 1 1 1 1 1 1 + 2+ 2= 2+ 2+ 2 . a b c a′ b′ c′