Ricardo is constructing the inscribed circle for △ABC . He has already used his compass and straightedge to complete the part of the construction shown in the figure.
Which construction could be his next step?
Construct the angle bisector of ∠SBQ .
Construct the line through points A and R.
Construct the angle bisector of ∠A .
Construct the perpendicular to BC¯¯¯¯¯ through point R.