A draftsman made an incomplete design of a bridge. He has to construct the support BD which is perpendicular to the segment AC. He places the compass at B and draws two arcs at M and N, as shown.

A triangle ABC is shown. D is the midpoint of AC. BD is perpendicular to AC. A dotted line joins points B and D. Two small arcs intersect AD at point M and DC at point N.

Which statement best describes the next step of the construction?

Question

A draftsman made an incomplete design of a bridge. He has to construct the support BD which is perpendicular to the segment AC. He places the compass at B and draws two arcs at M and N, as shown.

A triangle ABC is shown. D is the midpoint of AC. BD is perpendicular to AC. A dotted line joins points B and D. Two small arcs intersect AD at point M and DC at point N. 

Which statement best describes the next step of the construction?