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L = 1/2 X 3,14 X (2,5)²
L = 1/2 X 3,14 X 6,25
L = 1/2 X 19,625
= 39,25 cm²
Maaf, kalau salah.
= 19.625
Jadi luas 1/2 lingkaran = 1/2 x 19.625
= 9.8125 cm2