The formula would be when you take pi and divided it by a prime number such as 147 and then find the circurmfrence of a circle, take the radius and multiply the radius by the diameter, and then take the number you started with and add it to pi (3.14784634672435893746453... ect.) pi is an never ending number so just round it to 3.14 and then that will be your answer hope this helps
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T= 0.165V/As v= volume of the hall a= absorption coefficient s= surface area
power= energy time the time in seconds power= energy time the time in seconds
BS standards are british standards EN standards are European Union standards. For individual differences you would need to look at the particular standard you are concerned with. There are many thousands.
Power is energy divided by time, P=E/t.
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