Trigonometry

It comes from a role she had in a play. Her real name was Betty Mae

http://www.window.state.tx.us/taxinfo/proptax/tx96_295/land.html

The function of a magnetic compass is to show the direction toward the magnetic poles of the Earth. It is used as a navigation tool.

Although Descartes is generally credited with inventing analytical geometry, several aspects had been used by the Greek mathematicians Menaechmus (4th century BC) and Apollonius of Perga (3rd century BC).

Much later (11th century), the Persian mathematician Omar Khayyam, used methods which modern mathematicians consider akin to analytical geometry.

In 1637 Rene Descartes published his work on the topic but it was incomplete and was in French. It took another decade or so before it was translated into Latin and some of the gaps filled that Descartes' ideas took off.

Given only the measure of an angle, use a scientific calculator or a book of mathematical tables (if you can find one!).

There are infinite series but they are not particularly easy to work with.

Cartesian coordinate system.

You can call it anything you like.

budosnp

It is called a tetracontakaidigon.