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4 phi r^2 : 4 phi r + 2 phi r t
(2 phi ) 2 r^2 : (2 phi ) (2 r + r t)
2 r^2 : (2r + r t)
2 1^2 : 2 x 1 + 1 x 2
2: 4
1:2
4.3,14.1² : 2.3,14.1(1+2)
12,56 : 6,28.3
12,56 : 18,84
6,28 : 9,42
3,14 : 4,71