Chapter 5 • Class 9 Mathematics
Introduction to Euclid's Geometry
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1
Euclid's Approach to Geometry
Who was Euclid? Euclid was a Greek mathematician who lived around 300 BCE in Alexandria, Egypt. He is often called the "Father of Geometry" because he…
Start this topic → 2Definitions, Axioms, and Postulates
What are Definitions? Definitions explain the precise meaning of geometric terms. Euclid started his "Elements" with 23 definitions. Common Definition…
Start this topic → 3Equivalent Versions of Euclid's Fifth Postulate
What is the Fifth Postulate? Euclid's fifth postulate is the most famous and controversial of his postulates. It states: "If a straight line falling o…
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