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1m = 10 dm
30cm = 3 dm
V = (1/2×a×t)×t
=(1/2×(a×3dm))×10dm
a =(1/2×3dm)×10dm
=1,5dm×10dm=15dm
=72dm÷15dm=4,8dm
cek: (1/2×(4,8dm×3dm))×10dm
:1/2×(14,4dm²×10dm)
:1/2×144dm³
:72dm³ / l