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phi × r × s - phi × r x s
3,14 x 10 x ( 12 + 8 ) - 3,14 x 5 x 8
31,4 x 20 - 125,6
628 - 125,6
502,4 cm^ 2
5. r = d: 2 = 28 : 2
r = 14 cm
maaf nomor 5 masih ragu