You seem to be referring to the Pearson chi-square test-of-fit statistic. To do this you need not only the observed values in a frequency table (which you have) but the expected (or theoretical) values for that table.
In practical situations the expected values are obtained by making some educated guess about what distribution the observed values came from, estimating the parameters of that distribution and then using the estimated distribution to obtain the required expected values to calculate the chi-square.
In short, you need more information.
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The square of the hypotenuse minus the square of the leg you know will give you the square of the unknown leg.
336 cubic inches.
If yo have the area of the circle, the square is irrelevant. Radius = sqrt(Area/pi)
In a square, all four sides are of equal length. Divide the perimeter by four to find the length of each side: 12 ÷ 4 = 3 ft
ask your math tutor if you have left school and dont know this then ask your son if you dont have a son then ask your dog if you dont have a dog ask clint eastwood