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π d² = (28+4√13) π
d² = 28 + 4√13
d = √(28 + 2√52)
d = √(√26 +√2)²
d = √26 + √2
d = √2 (1 + √13)
(28+4√13) = 4 pi r²
28+4√13 / 4 x 3,14 = r²
28 + 4x3,6 / 12,56 = r²
28 + 14,4 / 12,56 = r²
42,4 / 12,56 = r²
3,376 = r²
√3,376 = r
1,837 = r
Diameter = 2xr
Diameter = 2x1,837
= 3,647