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A geometric star shape is concave. A star that is in the sky is convex.
In a real star, no. In a 2-dimensional star-shape, no. In 3-dimensional star-shapes, yes, there can be.
The correct term for a "star shape" would be a pentagram, for 5 pointed ones, hexagram for 6, and etc etc. I suppose it was nicknamed the "star" because of its points that streak out similar to a star.
no a star has 6 angles
A star has 10 sides and 5 vertices but if it's a decagonal star then 20 sides (10 for the star and 10 for the star) and 10 vertices (for the decagon in the middle, hence decagonal star). But, if it's pentagram star then 10 sides and 10 vertices.