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L.a = πr²
55 = 22/7 x r²
55 x 7/22 = r²
17,5 = r²
r = √17,5 cm
atau
r = 4,183... cm
soal b
v = L.a x t
11.000 = 55 x t
t = 11.000/55
t = 200 cm
soal c
d = 2r
d = 2√17,5cm
atau
d = √17,5 x 4
d = √70 cm
atau
d = 2.4,183...
d = 8,366... cm