Yes it is. 19cm=190mm. 25mm=2.5cm.
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25 mm = 2.5 cm therefore 20 cm is bigger, obviously
19cm = 7.5" appro.
is 19cm the same as 7.2 inches
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I cut out the lengths to have a visual look at the problem and the answer is NO you cannot arrange 5cm, 12cm, and 19cm into a triangle. Even straightening out the lengths of 5cm and 12cm into a 180 degree angle will not measure out to the 19cm. You cannot have a side that is more than the length of the other two sides combined in a triangle.