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66 = 2 x 3.14 x r
66 = 6.28 x r
66/6.28 = r
10.5 = r
luas = πr²
luas = 3.14 x 10.5²
luas = 3.14 x 110.25
luas = 346.18 cm²
r = k : 2 : π
= 66 : 2 : 22/7
= 33 x 7/22
= 10,5 cm
L = π x r²
= 22/7 x 10,5 x 10,5
= 346,5 cm²