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172.480=3,14×r²×70
172.480=219,8r²
r²=172.480 bagi 219,8
r²=784,71
r=√784,71
r=28,01
L= πr(r+2t)
L= 3,14×28,01(28,01+2(70))
L= 87.95(28,01+140)
L=87,95(168,01)
L= 14776.47 cm²
kalo gak salah
= 172480/70
= 2464 cm²