cm (centimeter) is a unit of length. I don't recognize dc as a unit of length, so most likely you can't convert it.
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you order unit fraction like this by smallest to biggest or biggest to smallest
The smallest angle will be opposite the smallest side of the triangle and so by using the cosine rule it works out as 43.84 degrees.
The greatest possible error should be one half of the smallest unit used. The smallest unit used here is a tenth of a metre - or 100 cm. So the greatest error is 50 centimetres. Unfortunately, measurements are often given to spurious levels of accuracy.
The atom is the smallest unit of an element that has all the properties of the element.
On a medical or room thermometer the smallest unit that you are likely to come across is 1 degree.