Squaring the Circle
A Math Forum Project
Table of Contents:
Famous Problems Home
The Bridges of Konigsberg
· Euler's Solution
· Solution, problem 1
· Solution, problem 2
· Solution, problem 4
· Solution, problem 5
The Value of Pi
· A Chronological Table of Values
· Squaring the Circle
· Finding Prime Numbers
· Zeno's Paradox
· Cantor's Infinities
· Cantor's Infinities, Page 2
The Problem of Points
· Pascal's Generalization
· Summary and Problems
· Solution, Problem 1
· Solution, Problem 2
Proof of the Pythagorean Theorem
Proof that e is Irrational
Squaring the circle is one of the three great problems of Classical Geometry,
along with the trisection of the angle and
the duplication of the cube. Since 1800 B.C. mathematicians have worked on the
problem of constructing a square equal in area to that of a given circle. Whether
or not this is possible depends, of course, on what tools you allow yourself. Plato
insisted that the problem be solved with straightedge and compass only. To achieve
this requires constructing a length equal to sqrt(pi) times the radius of the circle.
Thus when Lindemann proved in 1882 that Pi is transcendental (not the root of any
polynomial with rational coefficients) he effectively proved that the construction
was impossible with only straightedge and compass.
Please enjoy this picture while the Java Applet is loading.
Click on point C and drag to change the area of the square.
Can you make the area approximately equal to that of the circle?
What is the length of a side of the square when the areas are equal?
How does this compare to the length of the radius of the circle?
This applet was created using a prototype of JavaSketchpad, a World-Wide-Web component of The Geometer's Sketchpad. Copyright ©1990-1998 by Key Curriculum Press, Inc. All rights reserved. Portions of
this work are being funded by the National Science Foundation (awards DMI 9561674 & 9623018).
to A Chronological Table of Values Attributed to Pi
to Prime Numbers
© 1994-2014 Drexel University. All rights reserved.
Home || The Math Library || Quick Reference || Search || Help
The Math Forum is a research and educational enterprise of the Drexel University School of Education.