Start with two marked points A and B 2. Use a straightedge to construct line AB 3. Use a previous construction to construct a line perpendicular to AB passing thro 4. Use a previous construction to construct a line perpendicular to AB passing thro 5. Use a compass to construct a circle centered at A passing through B 6. Label an intersection point of that circle and the line from step 3 as C 7. Use a previous construction to construct a line parallel to AB passing through C 8. Label the intersection of that line and the line from step 4 as D 9. Use a straightedge to construct the segments AC, CD, and DB Explain why you need to construct a circle in step 5.