Calculation: cA0Klw - 1

S =

1

/ 2

* R^²* n* sin(

360

/ n

)

S =

1

/ 2

* R^²* n* sin(

360

/ n

) $S$ = $\frac{1}{2}\cdot R^{2}\cdot n\cdot sin(\frac{360}{n})$

S = 4* R^²* cos(

180

/ n

)* cos(

45

/ n

)* cos(

90

/ n

)* n* sin(

45

/ n

) $S$ = $4\cdot R^{2}\cdot cos(\frac{180}{n})\cdot cos(\frac{45}{n})\cdot cos(\frac{90}{n})\cdot n\cdot sin(\frac{45}{n})$