Many systems of silat use the triangle concept for throwing. (Silat is scattered widely throughout the Indonesian/ Malaysian/ Filipino archipelago, and was primarily a tribal method of self-defense. As such, effectiveness and styles vary greatly due to knowledge, experience, exposure, culture, geography, environment, religion and physical attributes of tribal inhabitants.)
The triangle concept for throwing in several silat styles is multi-leveled; however, it's most basic approach does include the eight directions principle used by japanese ju-jitsu. Other levels include utilizing the triangle in identifying points on the body that are more susceptible to imbalance, understanding rotational planes to assist in throwing, realizing collapsing areas with gravitational assistance, and others.
I am sure there are others who are better qualified than myself who can shed more light.