1 decimeter (dm) is .1 meters or 1/10th of a meter. A dekameter (dam) is 10 meters.
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1 meter
1 dm2 = (1 m / 10 dm)2 = 1/100 m2 or 0.01 m2
A decimeter (dm) is 10cm, or 1/10th of a meter, so 3.8 meters is 38dm.
1.11... recurring lots of 9 dm = 1 metre.
Hint: 1 dm = 10 cm...