SCIENCE|natural and applied sciences|applied sciences
- líne ingearach Tagairt "'Ár dTimpeallacht a Dhearadh,' Fondúireacht Eolaíochta Éireann, https://www.sfi.ie/resources/Ar-dTimpeallacht-a-Dhearadh.pdf [10.4.2019] ;Faomhadh an téarma seo mar chuid de Thionscadal Lex"
- ga
- perpendicular | perpendicular line
- en
- Sainmhíniú a straight line at an angle of 90° to a given line, plane, or surface Tagairt "COM-ET, based on: Wikipedia > Perpendicular, https://en.wikipedia.org/wiki/Perpendicular [22.3.2017]"