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5,024 = 4. 3,14. r²
5,024 = 12,56 . r²
r² = 5,024 : 12,56
r² = 2,5
d = 2,5 + 2,5 = 5
5024=4x3.14xr2
r2 =5024x4:3.14
r =6400
r = 80
d = 2.r = 2.80 = 160 cm