what are the dimensions of a lacrosse field?

Answer 1

Depends on what gender/level you're playing...

www.lacrosse.org has all of the dimensions

Answer 2

Outdoor men's lacrosse involves two teams of 10 players each competing to project a small ball of solid rubber into the opposing team's goal. The field of play is 110 yards (100 m) long and 60 yards (54 m) wide.[2] The goals are 6 feet (1.8 m) by 6 feet, containing a mesh netting similar to an ice hockey goal. The goal sits inside a circular "crease", measuring 18 feet (5.5 m) in diameter.[2]
http://en.wikipedia.org/wiki/Image:Mens_lacrosse_diagram.svg