3x+12=6 will give you x=2
And
-2=4-3x will give you x=-2
1.
When you have the length of two sides and the angle between them, the triangle is totally determined. This is, there is only one segment that can complete the triangle: its length and position is totally fixed.
<u><em>PLEASE PROVIDE AN EXAMPLE!</em></u>
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Without an example, the only thing I can tell you is a Polygon is a plane figure with three straight sides (or more) and angles. (usually 5 or more.)
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<em>Sorry, This was all I could provide with the amount of information given, please try to provide more information! If you have extra information, please let me know and I'll be sure to help!</em>
2.80 is more than 2, i would round it.
So sorry if this is wrong :(
