Lill's Method for Calculating the Value of a Cubic Polynomial

This Demonstration shows Lill's graphic method for calculating the value of a cubic polynomial using the Horner formulas:
and finally,
This is true by Thales's side-splitter theorem. For instance , .


  • [Snapshot]
  • [Snapshot]
  • [Snapshot]


This method is attributed to the French engineer Eduard Lill (1867).
The side-splitter theorem states: If a line parallel to one side of a triangle intersects the other two sides in different points, it divides the sides in the same ratio [2. p. 354].
[1] D. Kurepa, Higher Algebra (in Croatian), Zagreb: Skolska knjiga, 1965 pp. 1071–1073.
[2] H. R. Jacobs, Geometry (2nd ed.), New York: W. H. Freeman and Company, 1987.
    • Share:

Embed Interactive Demonstration New!

Just copy and paste this snippet of JavaScript code into your website or blog to put the live Demonstration on your site. More details »

Files require Wolfram CDF Player or Mathematica.

Mathematica »
The #1 tool for creating Demonstrations
and anything technical.
Wolfram|Alpha »
Explore anything with the first
computational knowledge engine.
MathWorld »
The web's most extensive
mathematics resource.
Course Assistant Apps »
An app for every course—
right in the palm of your hand.
Wolfram Blog »
Read our views on math,
science, and technology.
Computable Document Format »
The format that makes Demonstrations
(and any information) easy to share and
interact with.
STEM Initiative »
Programs & resources for
educators, schools & students.
Computerbasedmath.org »
Join the initiative for modernizing
math education.
Step-by-Step Solutions »
Walk through homework problems one step at a time, with hints to help along the way.
Wolfram Problem Generator »
Unlimited random practice problems and answers with built-in step-by-step solutions. Practice online or make a printable study sheet.
Wolfram Language »
Knowledge-based programming for everyone.
Powered by Wolfram Mathematica © 2018 Wolfram Demonstrations Project & Contributors  |  Terms of Use  |  Privacy Policy  |  RSS Give us your feedback
Note: To run this Demonstration you need Mathematica 7+ or the free Mathematica Player 7EX
Download or upgrade to Mathematica Player 7EX
I already have Mathematica Player or Mathematica 7+