BF₃ is trigonal planar. Exercise 3 of 29, checked as you type, with hints and an answer you can reveal. Every test case says what it got and what it expected.
Molecular point groups with their operations and character tables, the 230 space groups with a cell builder, and the 17 wallpaper and 7 frieze groups drawn live. The tool needs JavaScript, and WebGL2 for the 3D views; these are the pages it offers: