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L = 4 x phi x r x r
1386 = 4 x 22/7 x r^2
r^2 = 1386 x 7/22 x 1/4
r^2 = 110,25
r = 10,5
volume bola
v= 4/3 x phi x r x r x r
v= 4/3 x 22/7 x 10,5 x 10,5 x 10,5
v= 4851