In geometry, a polygon (/ˈpɒlɪɡɒn/) is a plane figure made up of line segments connected to form a closed polygonal chain.
Roger Smith, as well as the HAFMC’s founder David Smith, received funding from the National Institutes of Health, and reportedly the CIA, to study the effects of drugs like LSD and methamphetamine on the counterculture movement in San Francisco’s Haight–Ashbury District.
Polygons appear in rock formations, most commonly as the flat facets of crystals, where the angles between the sides depend on the type of mineral from which the crystal is made.