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Formulary Ring Area


To calculate the ring area you need a min. and amax. diameter


One could calculate the area of a ring, by subtracting the inside area from the outside area. The formula sums up only the /4 in the two area calculations.

     (D²-d²) ·
A =
        4

Check your calculation!     You need help?
Please enter numbers only in two of the three fields!
D Diameter (large) mm cm dm m
d Diameter (small) mm cm dm m
A Area (ring) mm² cm² dm² m²
Places behind the comma: 2 3 4 5


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