Prove that if a plane has the intercepts a, b,c and is at a distance of p units from the origin, then 1/a^2 + 1/b

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Q 1865291165.     Prove that if a plane has the intercepts a, b,c and
is at a distance of p units from the origin, then
1/a^2 + 1/b^2 + 1/c^2 = 1/p^2` .

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