# Coordinate Geometry - Parabola [closed]

Problem: A quadrilateral is inscribed in a parabola, then

(B) Diagonals of the quadrilateral may be equal.

(C) All possible pairs of adjacent side may be perpendicular.

(D) None of the above $$\quad$$ $$\blacksquare$$

Option (A) can be verified easily. I think both (B) and (C) are the criterion for rectangle, but I am unable to prove or disprove options (B) and (C). Please help.

• So finally why did you not settle for (D) as the answer? – Narasimham Dec 8 '18 at 15:45