Square ABCD is constructed with a compass and straightedge.
Which statement tells why line segment AB is congruent to line segment BC?

A.
The length of line segment CD is double the length of line segment AB.

B.
The lengths of line segment AB and line segment BC are measured with the straightedge.

C.
The lengths of line segment DB and line segment BA are measured with the straightedge.

D.
Line segment AB and line segment BC are radii of the same circle.

Question

Square ABCD is constructed with a compass and straightedge. 
Which statement tells why line segment AB is congruent to line segment BC?
  

 
 A.
The length of line segment CD is double the length of line segment AB.
 
 B.
The lengths of line segment AB and line segment BC are measured with the straightedge.
 
 C.
The lengths of line segment DB and line segment BA are measured with the straightedge.
 
 D.
Line segment AB and line segment BC are radii of the same circle.

anonymous · Answer

not sure hmm @mathmate

anonymous · Answer

I think D. http://static.k12.com/calms_media/media/802500_803000/802601/2/b619bff90cfc0fb2651a66f0cb5918e694d0505f/14_2137_13_question.jpg

mathmate · Answer

This is correct.  I appreciate that you did your research before giving an answer.
Do you understand how exactly the square is constructed?
(note: straight edge means it is NOT graduated, so cannot be used to measure).

anonymous · Answer

Thank you :) and yes