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Cristina Aurrecoechea

Send me an e-mail to

I am from Bilbao in Northern Spain.


Some links I like.


The Department of Mathematics Education

MacTutor History of Mathematics Site -- St. Andrew's University

Math Forum (alias Geometry Forum)

Furman University Mathematical Quotation Server

Project InterMath


Open this tools.gsp file for the explorations that use GSP; it contains all the tools that I generated and used on the assignments. Please send me email with any questions on how I do something or why I say something.



 Assignment 1

Interpreting the graphs


using Graphic Calculator

  Assignment 2

Interpreting the graphs and

using Graphic Calculator

Assignment 3

Roots of the quadratic and the cubic equations, in the xa and xb planes


using Graphic Calculator

 Assignment 4

Centers of a triangle, euler line and nine-point circle


using GSP

 Assignment 5


My GSP tools


 Assignment 6

  • Common tangents to two circles
  • Locus of points equidistant from focus and directrix

using GSP

  Assignment 7

Tangent circles


using GSP

 Assignment 8

Altitudes and Orthocenters


using GSP

 Assignment 9

Pedal Triangles


using GSP

 Assignment 10

Parametric equations of the cycloid


using Graphic Calculator

 Assignment 11

Polar equations:

  • a straight line

using Graphic Calculator

 Assignment 12

Maximizing the volume of a box made with a 5x8 sheet

using Excel

Final Assignment


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