I have an opportunity to quote 2 very large and oddly shaped flower beds to install mulch. I am trying to figure the area by parameter since it is not a normal shape. One bed is 285' (parameter) Would this formula work? 285' / 4 = 71.25' make it a square with 71.25' being the sides 71.25'(width) x 71.25'(height) = 5,077(sq feet) now convert to yards: 5,077 / 100 = 51 yrds of mulch I want to be real sure about the quantity on this one. Thanks in advance for any help on this.