L karton = 0,25 m²
=0,25 x 10000 cm²
=2500 cm²
L permukaan tabung = 2( L alas ) x L selimut tabung
=2 ( πr²)+ K alas x T
=2 (3,14 x 4² ) + 3,14 x 8 x 18
= 100,48 +452,16
= 552,64 cm²
siasa karton = 2500- 552 ,64
= 1947, 36 cm²
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L karton = 0,25 m²
=0,25 x 10000 cm²
=2500 cm²
L permukaan tabung = 2( L alas ) x L selimut tabung
=2 ( πr²)+ K alas x T
=2 (3,14 x 4² ) + 3,14 x 8 x 18
= 100,48 +452,16
= 552,64 cm²
siasa karton = 2500- 552 ,64
= 1947, 36 cm²