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Pc= 2×25×4 + 2×25×100 + 2×4×100= 6 000 cm²
2.
Pp=½×6×10=30 cm²
H= V÷Pp= 450÷30= 15 cm
3.
a²=144
a=12
V= a³=12³=1728 cm³
1l=1dm³=1000cm³
1728cm³=1,728 l
4. V= 20×15×3= 900 m³ ⅔V=600m³
1m³=1000dm³=1000l
600m³=600 000l