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176 = 2 r
r = 176 x
r = 4 x 7
r = 28
Luas Lingkaran = r²
Luas = x 28 x 28
Luas = 2464cm²
176 = 22 / 7 . d
176 . 7 / 22 = d
56 = d
luas = phi . r .r
= 22/7 . 28 . 28
= 2464