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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
It would look a bit weird, but the only way to achieve this is by curving the sides or by making a concave hexagon.
Well, isn't that a happy little question! A jeweller's mirror is usually concave, which means it curves inward like a bowl. This helps magnify the reflection and make it easier to see small details while creating beautiful pieces of art. Just remember, whether concave or convex, mirrors always reflect the beauty that's within you.
Concave is a property of [irregular] polygons. A parallelogram cannot be concave.
no concave mirror is in shape of concave mirror