Any two lines or line segments that meet, will form a two dimensional angle. It measures the amount of rotation that is needed to get from one line to the other line.
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An octagon is a 2 dimensional object, not a 3 dimensional object. As such, it has 1 face, 8 corners, and 8 angles.
A heptagon.
Rhombus
A Pentagon
In a real star, no. In a 2-dimensional star-shape, no. In 3-dimensional star-shapes, yes, there can be.