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Pi R^2. Which would be 3.14*(2*2). Pi is always 3.14 and R is the radius of the diameter. The diameter is 4" so half of that which is the radius would be 2. Multiply 2*2 first then multiply by 3.14 The answer is going to be 12.56sqin, but I figured I'd teach you how to get to that conclusion.
-------------------- TEAM SUNDOWN AUDIO 2009 NSPL Car 1801-3600 Watt Record Holder: 151.2db 2009 NSPL Car 3601-Up Watt Record Holder: 152.6db 2009 NSPL Car Hardcore Record Holder: 155.2db 2009 NSPL Car 3601-UP, Car Hardcore, and Car Points World Champion Posts: 1847 | From: The Triad | Registered: Jan 2008
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