Euclid of Alexandria, An Influence That Spans Millennia

Euclid (circa 300 BCE) Father of Geometry?

Illustration of Euclid by an unknown artist, circa 1474, via Wikimedia

Euclid’s Elements

The 1704 Latin version of Euclid’s Elements, via Wikimedia
  1. Given two points there is one straight line that joins them.
  2. A straight line segment can be prolonged indefinitely.
  3. A circle can be constructed when a point for its center and a distance for its radius are given.
  4. All right angles are equal.
  5. If a straight line falling on two straight lines makes the interior angles on the same side less than two right angles, the two straight lines, if produced indefinitely, meet on that side on which the angles are less than the two right angles.

President Lincoln’s Take on Euclid’s Elements

One of the oldest surviving fragments of Euclid’s elements, dated to circa AD 100, via Wikimedia

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Dr. Aditya Nagrath

Dr. Aditya Nagrath

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Founder of Elephant Learning. Our math app is proven to teach kids 1 year of math in 3 months, guaranteed. Make math a tear-free zone in your house!