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r = 40/2 = 20cm
Llingkaran = r^2
= 3,14 x 20 x 20
= 1256cm^2
L1/4lingkaran = r^2
= 1/4 x 3,14 x 20 x 20
= 314cm^2
Luas seluruhnya = Llingkaran - 1/4Llingkaran
= 1256 - 314 = 942cm^2