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172.480cm³ = luas alas x 70cm
luas alas = 172.480cm³ / 70cm
luas alas = 2.464cm^2
jadi jawabannya adalah A. 2.464
172.480 cm³ = 22/7*r²*70 cm
172480 cm³*22/7= r²* 70 cm
24640cm³*22 = r²*70 cm
542080cm³/70cm = r²
7744 cm²= r²
88cm = r
l alas= πr²
l alas= 3.14* 88cm *88 cm
l alas = 2464 cm