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78, 5 = 3.14 x d
d = 25
r = 12.5
luas = π r²
luas = 3.14 x (12.5)²
luas = 3.14 x 156.25
luas = 490,625
78.5 = 3.14 x d
d = 78.5/3.14
d = 25
r = d/2
r = 25/2 = 12.5
L = phi x r²
L = 3.14 x 12.5²
L = 490.625 cm²