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THALES FROM MILETUS
philosopher and athematician
THALES' LIFE
• The dates of Thales' life are not exactly known but are roughly established by
a few datable events mentioned in the sources. According to Herodotus,
Thales predicted the solar eclipse of May 28, 585 BC. Diogenes Laërtius
quotes saying that Thales died at the age of 78 during the 58th Olympiad
(548–545 BC) and attributes his death to heat stroke while watching the
games.
• Several anecdotes suggest that Thales was not solely a thinker but was also
involved in business and politics.
• Thales’ political life had mainly to do with the involvement of the Ionians in
the defense of Anatolia against the growing power of the Persians.
SOME OF THALES MATHEMATIC
RESEARCH
• Diameter is the section that divides a circle in half
• Isosceles triangle has two equal base angles
• Two intersected lines form equal opposite angles
• Angle inscribed in a semicircle is a right angle
• The triangle is determined, if we know his base and the base angles
THALES’ THEOREM
In geometry, Thales' theorem states that if A, B and C are points on a circle
where the line AC is a diameter of the circle, then the angle ∠ABC is a right
angle.
INTERCEPT THEOREM
• The intercept theorem, also known as Thales' theorem (not to be confused
with another theorem with that name), is an important theorem in
elementary geometry about the ratios of various line segments that are
created if two intersecting lines are intercepted by a pair of parallels It is
equivalent to the theorem about ratios in similar triangle
APHORISMS
• What is difficult?
Get to know yourself.
• What is easy?
Give advice neighbor.
• What is divine?
This what has no beginning and end.
AND MORE OF THEM
• How you can most easily endure misfortune?
Seeing the enemy, hit by an even greater misfortune.
• Who is happy?
Who has a healthy body, soul and nature prone to education.