420 curcumfrence round to nearest tenth

we have in the curcumference : 420

we know : C=D*pi

SO : D=C/pi = 420/3,14 = 133,757961

and the raduis is R= D/2 = 66,878980

D is the diametre

C is the curcumference

R is the raduis

so

Good luck

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