If you draw a straight line on a piece of paper and place a protractor over it you will see the reading is 180 degrees. In this sense a straight angle is 180 degrees.
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An angle is formed by two rays that have the same endpoint. Tell why it makes sense that a straight angle forms a straight line.
The questions doesn't make sense. An angle isn't a parallelogram. Parallelograms are types of shapes while an angle are to rays.
This cannot be answered. This does not make any sense.
An angle of a hexagon can have any value between 0 and 360 degrees, so the question makes little sense.
A parabola has one vertex (but not in the sense of an angle), infinitely many points and no edges.