Answer:Construct a square of side length 4 cmStep-by-step explanation:* Lets explain how to construct a square polygon with side length 4 cm- Use your straightedge to draw a horizontal line- Measure on the horizontal line a segment of 4 cm- Label its endpoints by A and B (AB = 4 cm)- Open your compass at a distance greater then half AB (3 cm)- Put the pin of the compass at point B and draw an arc intersects AB at point E and the horizontal line at point F- Open the compass at a distance greater than the length of the side of the square (6 cm) and put its pin on the point E and draw an arc- Put the pin of the compass on the point F without changing the open of the compass and draw another arc- The two arcs intersect each other at point G- Join BG and measure 4 cm from point B and label the end point of the 4 cm by C- Open your compass at a distance 4 cm and put the pin on point C and draw an arc and put it on point A with the same distance 4 cm and draw another arc, the two arc intersect each other at point D∴ ABCD is a square of side length 4 cm# Look to the attached figure to more understand