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172.480=22/7×r×r×70
172.480=220×rkuadrat
172.480/220=rkuadrat
784=rkuadrat
r=√784
r=28
Luas alas tabung
=Π×r×r
=22/7×28×28
=2.464 cm2
9. K= 4×s
56= 4×s
56/4=s
14=s
s=14
luas persegi=s×s=14×14=196 cm2
10.L=Π×r×r
78,5=3,14×rkuadrat
78,5/3,14=rkuadrat
25=rkuadrat
r=√25
r=5