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A 'concave decagon' is a ten-sided shape with every other corner pushed in towards the centre. It forms a regular five-pointed star.
A star does not have a fixed number of sides as a triangle or quadrilateral does. A star may have five points, six points, or ten points. The number of sides is twice the number of points, so a six-pointed star has 12 sides.
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There are a few different types of star that can be drawn including a six pointed star and a five pointed star. Generally the best was to draw a perfect star is either with a lot of practice or to use a stencil.