1ft = 12 in
1in = 2.54 cm
1 cm = 0.01 m
(6*12*2.54*0.01)*(3*12*2.54*0.01) = 1.67 m**2
1.67 m**2 != 21 m**2
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21 square feet
The square root of 21 is 4.58257569495584.
Area of any circle = (pi) x (radius)2Radius = 1/2 of the diameterArea of the placemat = (pi) x (21)2 = 441 pi = 1,385.4 square centimeters = 0.13854 square meter
It is: 2 times the square root of 21 and it's an irrational number
plus or minus 21