Do a total of three Triangle Circulates except that when you become 1) the Apex dancer (for ApextoApex Triangles), or 2) the InFacing Base dancer (for BasetoBase Triangles); do your next Circulate to the other Triangle. (From ApextoApex Triangles, the Circulate is an Interlocked Triangle Circulate; from BasetoBase Triangles, the Circulate is to the diagonal opposite position.) Exchange The Triangle can be fractionalized into thirds.
From ApextoApex WaveBased Triangles (Very Centers lead)
 
From BasetoBase TandemBased Triangles (Trailing Centers lead)

Note: As with all Exchanges, do Circulates staying on the inside of your formation until the crossover point, and then do Circulates staying on the outside of the other formation (and adjust to end on footprints of the original formation).
Exchange The 3 By 1 Triangle [NOL] (Very Centers lead): (do a total of 4 Circulates).
 
Exchange The 3 By 1 Triangles [NOL] (Very Centers lead): (do a total of 4 Circulates).

See also Exchange The Box [C3A].