A triangle in common with other polygons has a total sum of 360 degrees of exterior angles.
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They are shapes.
rectangle, circle,square,triangle
Turn the 7 to form an angle with the other 7. It shapes a triangle.
The point of a triangle is called a vertex, same goes with rectangles and all other shapes with points.
I don't know about the second strongest but a triangle is the strongest. Even if each corner had a hinge, the triangle could not be bent whereas all other shapes do not have this property