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Its total surface area.
Triangle is plane with three sides and three angles. The sum of its inside angles is equal to 180 degrees.
The sum of the exterior angles of any polygon - no matter how many sides, no matter whether it is convex or concave - is 360 degrees.
7, 9, 11.You're welcome. Figure out your homework yourself next time. ya figure it you dumbo idiotic loser
Just area. Since there is no available term for the sum of the areas of all surfaces of a figure, we call that area of the "irregular" figure.