Construct a square \(RAMP\) of a diagonal \(6 \ cm\) without using a protractor.
Construction:

Step 1:
Step 2:
Step 3:
Step 4:
Thus, \(RAMP\) is the required square.
Answer variants:
Draw the perpendicular bisector \(XY\) to \(RM\). Let it bisect \(RM\) at \(O\).
With \(O\) as centre, draw arcs of radius \(3 \ cm\) on either side of \(O\) which cut \(OX\) at \(P\) and \(OY\) at \(A\).
Draw a line segment \(RM = 6 \ cm\).
Join \(RA\), \(AM\), \(MP\) and \(PR\).