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The "nine dots" puzzle. The puzzle asks to link all nine dots using four straight lines or fewer, without lifting the pen. The nine dots puzzle is a mathematical puzzle whose task is to connect nine squarely arranged points with a pen by four (or fewer) straight lines without lifting the pen or retracing any lines.
A Delaunay triangulation in the plane with circumcircles shown. In computational geometry, a Delaunay triangulation or Delone triangulation of a set of points in the plane subdivides their convex hull [1] into triangles whose circumcircles do not contain any of the points; that is, each circumcircle has its generating points on its circumference, but all other points in the set are outside of it.
In three dimensions, there are an infinite number of point groups, but all of them can be classified by several families. C n (for cyclic) has an n-fold rotation axis.. C nh is C n with the addition of a mirror (reflection) plane perpendicular to the axis of rotation (horizontal plane).
A demonstration of the Minangkabau style of silat.. Silat is the collective term for a class of martial arts from the Nusantara and surrounding geocultural areas of Southeast Asia.