A straight angle
A sphere
None.A 180 degree angle is a straight angle (technically), normally just a straight line!
nothing
The exterior angle sum of ANY plane polygon (ie 2-dimensional figure with straight sides) is 360 degrees.
If it is a 2-dimensional figure, it is a polygon.
The area of a 3 dimensional figure
It is its cubic capacity
A pentagon is a closed 2-dimensional figure bounded by five straight sides.
A pentagon is a closed 2-dimensional figure bounded by five straight sides.
A straight line is a one dimensional figure in geometry
A 2-dimensional figure. A 2-dimensional figure. A 2-dimensional figure. A 2-dimensional figure.
You could estimate. If it is not right, it is between 90 degrees and 0 degrees. If it is between right and straight angles, it would be between 90 degrees and 180 degrees. You can sort of figure out roughly where each and measurement was.