p= 34 cm
l= 21 cm
t= 15cm
luas kertas yang dibutuhkan
=2 (pl +pt +lt)
= 2 ( 34 . 21 + 34 . 15 + 21 . 15)
=2 (714 + 510 +315)
= 2(1539)
=3078cm²
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p= 34 cm
l= 21 cm
t= 15cm
luas kertas yang dibutuhkan
=2 (pl +pt +lt)
= 2 ( 34 . 21 + 34 . 15 + 21 . 15)
=2 (714 + 510 +315)
= 2(1539)
=3078cm²