Q: Is a star concave

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Yes it is.

A regular six pointed star.

because the point of origin would be on an outer point and around it the walls seem to cave in making it seem concave, in comparison to a regular polygon. When checking for concave polygons always compare what you are looking at to a regular polygon

It is a concave octagon.

A 'concave decagon' is a ten-sided shape with every other corner pushed in towards the centre. It forms a regular five-pointed star.

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Yes it is.

A regular six pointed star.

because the point of origin would be on an outer point and around it the walls seem to cave in making it seem concave, in comparison to a regular polygon. When checking for concave polygons always compare what you are looking at to a regular polygon

It is a concave octagon.

Easy answer: a star icon or the apple logo are examples of what a concave polygon looks like.A concave polygon has 1 interior angle greater than 180 degrees.you can see an example on:http://en.wikipedia.org/wiki/Convex_and_concave_polygonshttp://www.mathopenref.com/polygonconcave.html

concave

concave decagon

A 'concave decagon' is a ten-sided shape with every other corner pushed in towards the centre. It forms a regular five-pointed star.

The Star Trek logo, if made into straight lines, would be a concave quadrilateral. Simply draw a triangle. Now, at any point along the sides, make a new point and move it inward and it will be a concave quadrilateral.

The opposite of convex is concave. Concave shapes have an inward curve, while convex shapes have an outward curve.

Concave is a property of [irregular] polygons. A parallelogram cannot be concave.

plano concave