# What is Geometry?

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• 0:05 Geometry
• 0:46 Egyptian
• 1:17 Greek
• 2:41 French
• 3:18 Lesson Summary

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Lesson Transcript
Instructor: Yuanxin (Amy) Yang Alcocer

Amy has a master's degree in secondary education and has taught math at a public charter high school.

Geometry can be traced all the way back to 2000 BC. Watch this video lesson and learn how much geometry has grown over time, and how people from Egypt, Greece, and France have contributed to the geometry we now use today.

## Geometry

Geometry is not just a math topic created to make your life harder. It is a topic that was developed to answer questions about shapes and space related to construction and surveying. It answers questions about all the different shapes we see, such as how much space an object or shape can hold. Geometry even has application in the field of astronomy, as it is used to calculate the position of stars and planets. Over time, different people contributed new and different things to grow geometry from its basic beginnings to the geometry we know, use and study today.

## Egyptian

The first written record that we have of geometry comes from Egypt back in 2000 BC. Some of the earliest texts that have been discovered include the Egyptian Rhind papyrus, Moscow papyrus and some Babylonian clay tablets, such as the Plimpton 322. These early geometry works included formulas for calculating lengths, areas and volumes of various shapes, including those of a pyramid.

## Greek

The Greeks also contributed much to the study of geometry. Thales of Miletus, although a Greek, actually calculated the height of pyramids in the 7th century BC. The Greek mathematician Pythagoras is well-known, and you will hear and learn much about what he contributed to the study of geometry. Also in the 7th century BC, Pythagoras is credited with proving the Pythagorean Theorem, which we currently use today when working with triangles. The Pythagorean Theorem shows that the square of the hypotenuse is equal to the sum of the squares of the other two sides.

Another Greek mathematician, Euclid, introduced Euclidean geometry around 300 BC. Euclidean geometry is based on a collection of basic truths and definitions presented in the 13 books written by Euclid, known as Euclid's Elements. Euclid used these basic truths and definitions in proving other theorems, such as the one that says that if two triangles have two equal sides and the angle in between the two sides is equal, then the two triangles are congruent. We still use Euclid's method of proving theorems with the use of definitions today.

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