To construct a square, dominic uses his straightedge to draw ab⎯⎯⎯⎯⎯ . he opens the compass to the length of ab⎯⎯⎯⎯⎯ and draws a circle centered at point a, and then, without changing the compass opening, draws a circle centered at point b. he marks the intersections of the circles as points c and d. what should dominic do next? change the compass opening to the length of ca⎯⎯⎯⎯⎯ and draw a circle centered at point c and then at point d. change the compass opening to the length of cd⎯⎯⎯⎯⎯⎯ and draw a circle centered at point c. use a straightedge to join points c and a, c and b, d and a, and d and b. use a straightedge to join points c and d with a line.