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b)
c)
72*/360* = x/20π
360x = 1440π // :360x
x=4
L/360* = x/2π*r
60*/360* = x/20π
360x = 1200π //:360x
x=3,3333333...
L/360* = x/2π*r
12*/360* = x/20π
360x = 240π //:360x
x=0,66666666... (2/3)