Descartes Quadratic 
René Descartes came up
with this way to solve a special case of the quadratic equation geometrically.

Descartes Multiplication 
René Descartes came up with this way to multiply geometrically.

Construct √2 Using Geometry 
Geometry and numbers are closely related. Given a line segment of length 1, you
can construct a line segment of length √2.

Construct √3 Using Geometry 
Geometry and numbers are closely related. Given a line segment of length 1, you
can construct a line segment of length √3.

Construct √5 Using Geometry 
Geometry and numbers are closely related. Given a line segment of length 1, you
can construct a line segment of length √5.

Construct √6 Using Geometry 
Geometry and numbers are closely related. Given a line segment of length 1, you
can construct a line segment of length √6.
