1. The problem statement, all variables and given/known data 2. Relevant equations Flux = ∫E.ds 3. The attempt at a solution I need to get the projection of cone on a plane perpendicular to the electric field . The area thus obtained when multiplied by electric field would give the flux . I am not able to imagine the projected area .Is there a systematic way to calculate the projected area ? I would be grateful if somebody could help me with the problem .