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Message: <blockquote data-quote="Norfleet" data-source="post: 845475" data-attributes="member: 11581">Well, detect magic has a rated range of about 60 feet. It detects in a "quarter circle", which would be a 90-degree arc, meaning a 45-degree angle from the center line. The area of this construct is therefore of 0.25*PI*60^2 = 2827 ft^2.Using this for invisibility scanning, a blip indicates your invisible opponent is somewhere within this area.Webs and Fireballs have a 20-foot radius of effect, by default, and a range which easily allows you to target any point within this arc.These, therefore have an area of effect, therefore, of PI*20^2 = 1256 ft^2.A rough glance suggests that most, say, about 90% of this will be able to fit within the pinged area, so you have a coverage on the order of 1100 ft^2. With just wild guessing, you have therefore a 1100/2827, or about 40% chance, of hitting your target just guessing wildly. A more educated guess can easily improve this, such as figuring that a newly detected target has just entered the area, and will therefore be on the outer edge, or the sweep line, depending on your search pattern.This chance becomes much greater if there's a metamagic feat you have which can enlarge the area of effect even slightly, or if a more suitable coverage spell than the ones that come to mind above can be used instead.FIRE IN THE HOLE!Hey, beats waiting 3 rounds.</blockquote>