39 squared is 1521.
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I'm worried that I may not understand your question. If you mean, "What is the numerical answer to 39 squared?" IE., 39^2 or 39x39, you can type it into a calculator or use long multiplication to find out that it is 1521. If you are asking about what 'squared' is: Squaring a number is the same as multiplying it by itself 2 times, so 39^2 = 39 x 39 We can also say that the number 39 is being raised to the power of 2. Cubing a number is multiplying it by itself 3 times (to the power of 3), so 39^3 = 39 x 39 x 39 Note: The little ^ thing indicates that the 2 and 3 coming after it are smaller and written up in the corner.
It's greatest possible perimeter: 1+39+1+39 = 80 feet
The interior angles of a 39 sided polygon add up to (39-2)*180 = 6660 degrees
39 inches / pi = 12.4 inches
The answer depends on which angle is 39 degrees.