Click the Convex Shapes!

Can you pick the shapes that are convex, and avoid the ones that are concave?

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  • Here are two examples of methods to determine whether a shape is convex or not:
    1) Imagine if you walked around the outline of the shape. If every corner was a right turn, or every corner was a left turn, it's convex.
    2) Pick two vertices of the polygon and draw a line connecting them. If it's possible to find two points such that the connecting line goes outside the shape, then it is NOT convex.
  • Assume all vertices of polygons are exactly on grid points. Be careful - look at edges carefully to see if they're straight or not!
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Last Updated: Jul 29, 2020
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