If S is the circumcentre of a △ ABC and D,E,F are the feet of the altitudes of △ ABC then prove that SB is perpendicular to DF

If S is the circumcentre of a △ ABC and D,E,F are the feet of the al

1.	If S is the circumcentre of a △ ABC and D,E,F are the feet of the altitudes of △ ABC then prove that SB is perpendicular to DF
Answer» If S is the circumcentre of a △ ABC and D,E,F are the feet of the altitudes of △ ABC then prove that SB is perpendicular to DF