Maynard James Keenan formed A Perfect Triangle.
A Perfect Circle is an American rock supergroup formed in 1999 by guitarist Billy Howerdel and Tool vocalist Maynard James Keenan . Maynard James Keenan . Keenan is also the lead singer of A Perfect Circle . Triangle . In Euclidean geometry any three points , when non-collinear , determine a unique triangle and a unique plane ( i.e. a two-dimensional Euclidean space ) . This article is about triangles in Euclidean geometry except where otherwise noted .