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phi x r² = 1,54
22/7 x r² = 1,54
r² = 1,54 : 22/7
r² = 1,54 x 7/22
r² = 0,49
r = √0,49
r = 0,7 dm
1,54 = 22/7 r²
r² = 1,54 x 7/22
r² = 10,78 / 22
r² = 0,49
r = √0,49
r = 0,7 dm