**Geometer**- is a mathematician who works in the field of geometry.

**Famous Geometers**

**Thales of Miletus (624 BC – 546 BC)**

▪ Greek Philosopher

▪ used geometry to solve problems such as calculating the height

of pyramids and the distance of ships from the shore

▪ He is credited with the first use of deductive reasoning applied to

geometry, by deriving four corollaries to

**Thales' Theorem**

▪ was the first person known to have studied electricity

**Euclid (300 BC) aka “Euclid of Alexandria”**

▪ a Greek mathematician

▪ often referred to as the "Father of Geometry“

▪ Known for

**Euclidean Geometry &**

**Euclid's Elements**

**Archimedes of Syracuse (287 BC – 212 BC)**

▪ a Greek mathematician, physicist, engineer, inventor, and

astronomer

▪ gave a remarkably accurate approximation of

**pi**

▪ proven that

*the volume and surface area of the sphere are two thirds that of the cylinder*

*including its bases (his favorite mathematical proof)*

Vsphere = 2/3 Vcylinder

Asphere = 2/3 Acylinder

**Rene Descartes (1596-1650)**

▪ Father of Modern Philosophy

▪ French philosopher and mathematician

▪ developed dualistic theory of mind and matter

▪ introduced the use of

**coordinates**to locate a point in two or three

dimensions

**C**

**artesian Coordinate System**

specifies each point uniquely in a plane by apair of numerical coordinates, which are the signed distances from the point to two fixed perpendicular directed lines, measured in the same unit of length. Each reference line is called a coordinate axis or just axis of the system, and the point where they meet is its origin, usually at ordered pair (0,0).

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