2d, or an unfolded version of a shape
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A Mathematically Definition Would Be: If An Angle Is a Right Angle, Then It's Measure Is 90 Degrees. We Talked About This In Math Today :)
Are determined by (a) the shape of the flat surface, (b) the area of the flat surface, and (c) the size of the square units.
In math, the definition of a supplementary line is A line where the two or more angles within the line equal 180 degrees.
a 3d object made of 2d faces with all flat sides
A plane mirror is a mirror which is completely flat, easier for your image to be reflected.