Convex polygons are polygons for which a line segment joining any two points in the

The word interior is important. You cannot choose one point inside and one point outside the figure

The following figure is convex:

No matter how I choose two points inside this polygon, the line segment joining these two points will always be inside the figure.

Notice that a triangle, isosceles, scalene, right, or obtuse is always convex

Rectangles, squares, and trapezoid too are always convex

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