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r = diameter /2
r = 21/2
r = 10,5
L1 = 22/7 x 10,5²
L1 = 22/7 x 110,25
L1 = 346,5
L2 = π x r²
r = 10/2
r = 5
L2 = 3,14 x 5²
L2 = 3,14 x 25
L2 = 78,5
L1 - L2 = 346,5 - 78,5 = 268cm