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78,5 = 3,14 r²
r²= 78,5 : 3,14
r = √25
r = 5
K = 2πr
= 2 x 3,14 x 5
= 31,4 cm
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78,5 = 3,14 x r²
r = 78,5 : 3,14
r =
r = 5
K = 2 . π . r
= 2 x 3,14 x 5
= 31,4 cm