Joe uses the following steps to construct a perpendicular line through a point C on a line segment.

Step 1: From point C, draw an arc intersecting the line segment in points A and B.
Step 2: Use a straightedge to draw an arc from point A, one above and the other below the line.
Step 3: Without changing the compass width, draw two arcs from point B, above and below the line segment.
Step 4: Label the point of intersection of the arcs above the line segment as Q and below the line as R.
Step 5: Using a straightedge, join points Q and R.

Question

Joe uses the following steps to construct a perpendicular line through a point C on a line segment.

Step 1: From point C, draw an arc intersecting the line segment in points A and B.
Step 2: Use a straightedge to draw an arc from point A, one above and the other below the line.
Step 3: Without changing the compass width, draw two arcs from point B, above and below the line segment.
Step 4: Label the point of intersection of the arcs above the line segment as Q and below the line as R.
Step 5: Using a straightedge, join points Q and R.

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 Joe.

anonymous · Answer

@dpaInc

anonymous · Answer

first incorrect step is 2
from point A and B draw arcs above and below the line.  then draw a line using straightedge through the intersection of those two arcs above and below the line.

anonymous · Answer

@dpaInc do you have part be? or could you explain me?

anonymous · Answer

@dpaInc sorry it would be part c... Explain why a compass works for the construction done by Joe. ?