set square

triangular piece of plastic, metal or wood with angles of 90 , 60 and 30 (or 90, 45 and 45), used for drawing straight lines, esp at these angles 三角板; 三角尺.

set apart, set aside, set back, set down, set fire to, set forth, set free, set in, set light by, set off, set on sb, set oneself against, set oneself up as, set out, set out to, set piece, set sb against sb, set sb down, set sb up, set sb/sth apart (from sb/sth), set sth aside, set sth back (sth), set the table, set theory, set to, set up, set-back, set-to, set-up, set...as objective, setback, setline, sett, settee, setter, setting, settle, settle (sb) in/into sth, settle down, settle for,