It might have been possible to answer the question if you had bothered to say who or what they are. But since you have not provided that crucial bit of information, I cannot provide a more useful answer.
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Whilst I agree with the above answer, to try to attempt an answer: The sum of their (all) measurments is to add any measurements together to reach a total!
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For a set of measurements, the mean valueis the sum of all the measurement values divided by the number of measurements in the set.
moro than 180
Supplementary angles total 180 degrees.
The perimeter is the sum of the sides of a poylgon and and the area is the square measurements inside it
No the given measurements would not make a triangle because in order to construct a triangle the sum of its smallest sides must be greater than its longest side.