Board Thread:Wiki discussion/@comment-4881935-20130327060139/@comment-897664-20130327213600

ProtonZero's reply pretty much sums it all.

Using Kruxfix's reply to provide more details, you can add another stat like maximum effective range or something by using his formula (skill range + (aoe diameter/2) ) for aoe skills.

How about arc spells? Talon's Rake, Syndra's Scatter and the like. It would probably use radius and angle in conjunction.