Convex polygons
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The word interior is important. You cannot choose one point inside and one point outside the figure.
The figure above with six sides meets this criteria and therefore is a convex polygon.
No matter how I choose two points inside this polygon, the line segment joining these two points will always be inside the figure.More examples of convex polygons
Notice that a triangle such as an isosceles triangle, a scalene triangle, a right triangle, or an obtuse triangle is always a convex polygon.
Rectangles, squares, and trapezoids too are always convex as well
Finally, all regular polygons, such as a pentagon, hexagon, septagon, octagon, and so forth are always convex
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