The interior angles add up to 1800 degrees
A nineteen sided polygon is called a Nonadecagon or an Enneadecagon.
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The name of a 19 sided polygon is Enneadecagon.
Twelve square miles is the area.
The sum of twelve and what?
Yes.
51 sum means add
The sum of a dozen is twelve.
One more that nineteen; twice; as, twenty men., An indefinite number more or less that twenty., The number next following nineteen; the sum of twelve and eight, or twice ten; twenty units or objects; a score., A symbol representing twenty units, as 20, or xx.
473
it is nineteen twenties
nineteen is not equal to the sum of one and one tenth of one hundred
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17
In order to find the mean of numbers, add up all of the numbers and thn divide it by the number of numbers there are. Adding two, five and twelve equals nineteen. Then divide three into nineteen, and this gives you a mean of 6.33.