François Viète

Viete's construction of the regular heptagon

http://math.berkeley.edu/~robin/Viete/construction.html

Viete: triangle

In a right triangle, let the perpendicular be 5 and the sum of the base and hypotenuse 25. Find the lengths of the base and hypotenuse.

http://mathdl.maa.org/mathDL/46/?pa=content&sa=viewDocument&nodeId=2309

Viete: triangle II

In a right triangle, the hypotenuse is 9.434 and the sum of the sides around the right angle is 13. Find the lengths of the sides around the right angle.

http://mathdl.maa.org/mathDL/46/?pa=content&sa=viewDocument&nodeId=2310