<s>[INST] The area of some regular polygon can be expressed as \(\pi r^2 * \frac{\tan{\pi/n}}{\tan{\frac{\pi}{n}}}\). I can simplify the formula to \(\pi r^2 * \tan{\pi/n}\), but then I'm stuck. 

Given that I have \(R(360°, r) = A(2 \pi r^2) = C(r)\), where \(R(360°, r)\) is a regular polygon with 360° inscribed in a circle with radius \(r\), \(A(2 \pi r^2)\) is a circle with area \(2 \pi r^2\), and \(C(r)\) is a polygon (using your simple formula expressed above), I want you to finish the uncovered remainder of the expression.

Note:
n = 360° /?[/INST]