But many people could not tell you what the triangle or circle symbols mean. The white triangle on clothes labels can take four forms: an empty triangle, a triangle with a cross through it ...

Circle, triangle, and square. They’re simple, geometric, and eerily familiar. They look like something pulled straight out of a PlayStation controller or a childhood game of tic-tac-toe.

AO and OC are both radii of the circle. Length AO = Length OC Draw the line OB. It creates two triangles OCB and OAB. These share the length OB.