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=8.8 - 4^2 phi
=64-16phi
=16(4-phi) (D)
= 8 x 8
= 64
luas lingkarang = πr^2 ( π = 1/2 x 8 = 4)
= π x 4 x 4
= 16 π
luas persegi - luas linkaran
= 16 (4 - π) (D)