Töwerek we onuň meýdany

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r radiusly töwerek üçin formulalar:

Töweregiň uzynlygy:u = 2 r π
Meýdany:A = r2 π

π san:

π = 3,1415926535 8979323846 2643383279 5028841971 6939937510
          5820974944 5923078164 0628620899 8628034825 3421170679 ...