A 21 Gage Steel plate is about 1/32 inch thick. Various charts put it at .032" to .033". That is for plain steel. Galvanized, aluminum and stainless have different measurements for the same gage.
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Volume = pi * r2 * h = pi * (21/6)2 * (6/36) since 21 foot diameter = 21/2 foot radius = 21/6 yard radius and 6 inches = 6/36 yards so volume = 6.414 cu yards.
441 with a half inch spacing between each paver . Your true size of the patio would be 21'-10"x 21'-10". Not 22'. Just to clarify if that make a big difference. Ed F.
(21-21)+(21-21)+21 = 0+0+21 = 21
The LCM is 21.
21