Then its side lenth = Sqr root (36 mm^2)
So = 6 mm onle without squareDo the units under the square root sign change when you remove the root sign?Yes, they do change, so it is 6mm
Also, 6 mm * 6mm = 36 mm^2Do the units under the square root sign change when you remove the root sign?Yes, units go through the same changes as the number, so remove the square from the unit when you solve for the square root.
Actually, it has two roots:
-6 mm
+6 mm