The term 'PREFIX WITH ANGULAR' is composed of THREE words, each with a different prefix. The first word is TRI, which is a THREE-letter prefix meaning 'THREE'. The second word is RECT, which is a four-letter prefix meaning 'four'. The third word is EQUI, which is a four-letter prefix meaning 'EQUAL'. Together, these THREE prefixes form the phrase 'PREFIX WITH ANGULAR', which refers to the THREE-dimensional shape of an object that has THREE EQUAL sides and angles.