L permukaan kubus = 6 x L sisi kubus
= 6 x s²
= 6 x 20²
=6 x 400
=2400 cm²
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=6 . 20²
=6 .400
=2400cm²
L permukaan kubus = 6 x L sisi kubus
= 6 x s²
= 6 x 20²
=6 x 400
=2400 cm²