Brandon uses the following steps to construct a perpendicular line through a point C on a line segments. He first draws two arcs from point C intersecting the line segment in point A and B. The next four steps are listed below.

1. Using the same compass width draw two more arcs from point C, one above and the other below the line.
2. Without changing the compass width draw two arcs from point B and below the line segment.
3. Label the point of intersection of the arcs above the line segment as M and below the line as N.
4. Using a straightedge, join point M and point N.

Question

Brandon uses the following steps to construct a perpendicular line through a point C on a line segments. He first draws two arcs from point C intersecting the line segment in point A and B. The next four steps are listed below.

1. Using the same compass width draw two more arcs from point C, one above and the other below the line. 
2. Without changing the compass width draw two arcs from point B and below the line segment.
3. Label the point of intersection of the arcs above the line segment as M and below the line as N. 
4. Using a straightedge, join point M and point N.

anonymous · Answer

Part A: Which is the first incorrect step?
Part B: using complete sentences, explain your answer for part A.
Part C: Explain why a compass works for the construction done by Brandon.

anonymous · Answer

Try doing this yourself on a piece of paper.

anonymous · Answer

You'll see the error immediately.

anonymous · Answer

the thing is i dont have a compass :/

anonymous · Answer

Use something else that is round.

anonymous · Answer

i did, but i think i did it wrong. can you explain it to me?

anonymous · Answer

Step 3 is the incorrect step, we should use the same compass width. Otherwise the arcs won't intersect