Introduction to Euclid's Geometry
Bihar Board · Class 9 · Mathematics
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What does the word 'geometry' mean in Greek?
According to Euclid, a point is defined as:
How did Euclid define a line?
What is the difference between axioms and postulates according to Euclid?
Sample Questions
Which civilizations used geometry in ancient times?
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Egypt, Babylonia, India, Greece, China
Geometry was studied in various forms in many ancient civilizations including Egypt, Babylonia, China, India, Greece, and the Incas. Each civilization developed geometry to solve practical problems.
Which terms are kept undefined in geometry?
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Point, Line, Plane
Point, line, and plane are kept as undefined terms in geometry because defining them leads to circular definitions. We understand them intuitively and represent them with physical models.
Which axiom states 'Things which are equal to the same thing are equal to one another'?
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Axiom 1
This is Euclid's first axiom. It means if A = C and B = C, then A = B. This is the transitive property of equality.
Euclid's first postulate states:
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A straight line may be drawn from any one point to any other point
Euclid's first postulate tells us that we can always draw a straight line between any two points. This establishes the basic construction ability in geometry.
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