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64π=π××r²
r²=√64
r=8cm
Ls=2×π×r×t
240π=2×π×8×t
240=16t
t=240/16
t=15cm
jdi nilai √r²+t²
=√ 8²+15²
=64+225
=√ 289
= 17 cm
smggga membantu :)