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100,1 = 3.14 x r x 9.1
100,1 = 28,574 x r
r = 100,1 : 28,574
r = 3,5 cm
t² = s² - r²
= 9,1² - 3,5²
= 82,81 - 12,25
= 70,56
t = √70,56
= 8,4