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How to convert? ... "I NEED TO CONVERT 3-3/4 inch dia. TO SQUARE INCHES" ... "3.75 squared * PI / 4" ... "convert 8 inch diameter into square inches convert 6 inch diameter into square inches" - read more

The formula to convert diameter to square inches is Pi divided by 4 multiplied by the diameter squared. For instance, if you have a diameter of 8' the equation - read more

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