Triangulation

Puzzle makers Sylvia Bursztyn and Barry Tunick are usually quite knowledgeable in their science-related clues, but in their March 18 crossword they had a little math confusion.

The common clue for 35 and 77 across was “geometry abbr.” The answers were COS (for cosine) and COSEC (for cosecant). However, these two terms are used in trigonometry, not geometry.

JOHN LANE

Stanton