NCERT Example 19 - Conic Sections
Question: A rod of length 15 cm moves with its ends on perpendicular axes. Find the locus of a point P that divides it into AP = 6 cm and PB = 9 cm.
Answer: x^2/81 + y^2/36 = 1.
Full step-by-step NCERT solution with diagrams on Something by Zero.