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176 = phi x d
176 = 22/7 x d
176 x 7/22 = d
d = 56 cm, r = 28cm
L = phi x r^2
= 22/7 x 28 x 28
= 2464 cm^2
4. Luas 2464 cm^2
pake cara yang nmer tiga, tinggal diganti aja, jawabannya sama kok.