Euclid

Haley,Casey,

&Mason H.

Father of Geometry

Interesting Facts

• Nobody knows anything about Euclid’s life or death other than that he lived when Ptolemy ruled.

Euclid of Alexandria was a Greek

mathematician.

He is responsible for obtuse and acute angles, planes, lines,

segments, rays, etc.

He is responsible for the geometric rules we follow today.

Euclid’s

Postulates

Number 1

 A straight line segment can be drawn by joining any two points

E X A M P L E

N U M B E R O N E

Number 2

E X A M P L E

N U M B E R T W O

Any straight line segment can be

extended indefinitely in a

straight line

Number 3

Given any straight line segment, a circle can be drawn with the segment

as the radius, and an endpoint as the center.

E X A M P L E

N U M B E R T H R E E

Number 4

All right angles are congruent.

E X A M P L

E

N U M B E R F O U R

Number 5(The parallel postulate)

If two lines intersect a third so that the inner

angles on one side equal less than

two right angles, then the two lines

must intersect each other eventually.

EXAMPLE

N U M B E R F I V E

• http://www.sztaki.hu/~schneider/Teaching/2GA2/eep.html

• http://www.mingl.org/matematika/topicsPages/geometry/euclideanandnoneuclidean.htm

• http://worldtodiscover.wordpress.com/2009/04/14/two-parallel-lines-never-meet/