Liam is constructing a square in which two of its vertices are points a and b. he has already used his straightedge and compass to construct the lines and arcs shown. what should liam do for his next step? use the straightedge to draw a horizontal line that contains point e. place the point of the compass on point b and draw an arc that intersects be¯¯¯¯¯ , using ab as the width for the opening of the compass. place the point of the compass on point a and draw any arc above it. use a straightedge to draw ae¯¯¯¯¯ .