28. The distance of a variable plane from the origin is p. It intersects the co-ordinate axes at A, B, C then prove that the centroid of Δ ABC is on (1/x²) + (1/y²) + (1/z²) = (9/p²).

28. The distance of a variable plane from the origin is p. It intersec

1.	28. The distance of a variable plane from the origin is p. It intersects the co-ordinate axes at A, B, C then prove that the centroid of Δ ABC is on (1/x²) + (1/y²) + (1/z²) = (9/p²).
Answer» 28. The distance of a variable plane from the origin is p. It intersects the co-ordinate axes at A, B, C then prove that the centroid of Δ ABC is on (1/x²) + (1/y²) + (1/z²) = (9/p²).