Patrick is constructing the circumscribed circle for △RST.Which construction could be his first step?Construct the perpendicular bisector of ST¯¯¯¯¯ .Construct a copy of ∠S that is adjacent to ∠R .Construct the angle bisector of ∠T .Construct the angle bisector of ∠R .A scalene triangle R S T. Side T S is base.