Sign up for an Award
Participate with your entry in one of our professional or student awards.Sign up for an award
You are using an outdated browser. Please upgrade your browser to improve your experience.
therulerproblem of two parts,connected bydovetail.Twice thelengthofa rulercan drawthe line,The mainsolution todrawthe linebeyondthe length of therulerproblem.Whenthe length ofthe lineexceeds theruler,slidingpart,tickthe0pointon the scaleneeded forthe other part,todrawto the end.
Nanjing Forestry University