so you know to get the area yo do length times width. so we know l*w=36
so you also know a square has equal sides all around so. the length and the width have to be able =36. so lets get the multiplies of 36: (1,36)(2,16)(3,12)(4,9)(6,6) so looking at these you automatically should know (6,6) is the answer so the length is 6. hope this helps