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pole koła:
pi*r^2
pole wycinka koła dla 1 stopnia:
pi*r^2/360st. (st. - stopnie)
zatem dla kąta α wycinek ma pole:
α*pi*r^2/360st.
p%=(p/100)=0,0p
pi*r^2=α*pi*r^2/360st.+(p/100)*pi*r^2 /-(p/100)*pi*r^2
[1-(p/100)]*pi*r^2=α*pi*r^2/360st. /*360st.
[1-(p/100)]*pi*r^2*360st.=α*pi*r^2 /:pi*r^2
[1-(p/100)]*360st.=α