Points and Lines	#	Triangles	#	Polygons - General	#	Conics	#
parallel - no transversal		acute scalene		square		circle with diameter
parallel - perpendicular transversal		isosceles		concentric squares		circle w/o diameter
parallel - non-perpendicular transversal		equilateral		rectangle		concentric circles
vertical angles		concentric		concentric rectangles		externally tangent circles
supplementary adjacent angles		right		trapezoid		internally tangent circles
complementary adjacent angles		obtuse		right trapezoid		circle - chords not diameters
skew lines		similar		parallelogram - no right angles		minor arc
concurrent lines		congruent		kite		major arc
				rhombus		semicircle
				pentagon		ellipse
				hexagon		sphere
				heptagon		inscribed circle
				octagon		spiral
				octagon - not regular		cylinder
				concave polygon		cone
				pyramid