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= 8 × 1000= 8000cm³/menit b
2. Luas 1= 1/2 ( a+ b) × t
=1/2 ( 42+64)×19=1615
= 1615×2=3230
Luas 2. = p×l
= 64×29=1216
= 3230-1216=2014 b