The links below have definitely changed addresses.

• Main
  • Homepage
  • About us
  • Contact form
  • Sitemap
  
  
• Construction
  • Sizing stairs
  • Calculate a slope, a gradient, a tilt
  
  
• Geometry
  • The Cylinder
  • The Triangle
  • The slope, gradient, tilt
  • The Parallelogram
  • The Quadrilateral
  • The Evolute Helix
  
  
• Maths
  • Rule of three