INTRODUCTION TO EUCLID’S GEOMETRY-MCQs

Introduction to Euclid’s Geometry (Class 9 Maths Chapter 5) introduces students to the foundations of geometry developed by the ancient Greek mathematician Euclid. This chapter explains points, lines, planes, postulates, axioms, and theorems, forming the basis of Euclidean Geometry. Students learn how logical reasoning, definitions, and postulates form the framework for geometric proofs. The following 50 multiple-choice questions (MCQs) are designed to help students master key concepts, prepare for exams, and strengthen their understanding of geometry fundamentals as per NCERT Class 9 syllabus.

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TRIGONOMETRIC FUNCTIONS-Exercise 3.1

Exercise • Jan 2026

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Exercise

INTRODUCTION TO EUCLID’S GEOMETRY

by Academia Aeternum

1. Who is known as the “Father of Geometry”?
2. The word ‘Geometry’ is derived from the Greek word ‘Geo’ meaning ____ and ‘metron’ meaning ____.
3. Euclid’s book Elements consists of how many books?
4. Which ancient civilization’s geometry mainly focused on measurement?
5. A ‘point’ has ____.
6. A line has ____.
7. A plane surface has ____.
8. Euclid’s geometry is based on ____ and _____.
9. The total number of Euclid’s postulates is ____.
10. Euclid’s fifth postulate is also known as ____.
11. According to Euclid’s first postulate, a straight line can be drawn ____.
12. Euclid’s second postulate states that ____.
13. According to Euclid’s third postulate, ____.
14. Euclid’s fourth postulate states that ____.
15. The fifth postulate involves ____.
16. If a straight line falling on two lines makes the interior angles on the same side less than two right angles, the two lines ____.
17. How many common notions did Euclid provide?
18. Common notions are also called ____.
19. Which of the following is an example of a common notion?
20. “If equals are added to equals, the wholes are equal.” This is ____.
21. The term “Axiom” refers to ____.
22. “A line has length but no breadth” defines a ____.
23. Geometry developed by Euclid is known as ____.
24. Non-Euclidean Geometry was developed when mathematicians modified ____.
25. The smallest figure in geometry is ____.
26. Two points determine ____.
27. Three non-collinear points determine ____.
28. The word ‘Elements’ in Euclid’s book refers to ____.
29. A part of a line with two endpoints is called a ____.
30. A part of a line with one endpoint is called a ____.
31. If two lines are perpendicular, the angle between them is ____.
32. Which of the following is not an undefined term in geometry?
33. The intersection of two lines is a ____.
34. The intersection of two planes is a ____.
35. Which of the following is a correct statement?
36. Euclid’s geometry is based on ____.
37. Which of the following statements is false according to Euclidean geometry?
38. Euclid’s postulates are ____.
39. The study of geometry was first started by ____.
40. The point where two rays meet to form an angle is called ____.
41. Which of these is an example of a real-life line segment?
42. “If equals are subtracted from equals, the remainders are equal.” This is ____.
43. The statement “Things which coincide with one another are equal to one another” is ____.
44. Euclid’s geometry deals with ____.
45. Which of the following is an example of non-Euclidean geometry?
46. In Euclidean geometry, the sum of angles of a triangle is always ____.
47. Geometry dealing with three-dimensional figures is called ____.
48. Which mathematician developed Non-Euclidean Geometry?
49. Euclid lived in ____.
50. Euclid’s geometry forms the basis for ____.

Frequently Asked Questions

Euclid’s geometry is a logical system based on definitions, axioms, and postulates describing properties of points, lines, and planes.

Euclid, a Greek mathematician, is known as the father of geometry.

Euclid’s axioms are self-evident truths that apply to mathematics and form the foundation of geometric reasoning.

1. A straight line can be drawn joining any two points; 2. A line can be extended indefinitely; 3. A circle can be made with any center and radius; 4. All right angles are equal; 5. If a line touches two others so that interior angles sum less than 180°, lines meet.

An axiom is a universal truth, while a postulate specifically applies to geometry.

A point is a location in space with no size, dimension, or length.

A line is a length without breadth, and a plane is a flat surface that extends infinitely.

It explains the concept of parallel lines and led to the development of non-Euclidean geometries.

It forms the foundation for all higher-level mathematics and helps develop logical reasoning skills.

They underpin all modern geometry and are used in mathematical proofs and real-life applications.

A straight line is a path traced by a point moving in the same direction.

Map making, architecture, engineering design, and graphic plotting.

Euclidean geometry deals with flat surfaces; non-Euclidean geometries describe curved spaces.

Geometry originated with land measurement, but Euclid systematized it with axioms and postulates.

Point, line, plane, angle, straight line, and circle.

Definitions provide clarity and a standard language for proofs and reasoning.

“Elements” is still a basis for mathematics education and a reference for geometric proofs.

A segment is part of a line with two endpoints, a ray starts at one point and extends infinitely, and a line extends in both directions.

Geometry is used in construction, navigation, art, and technology.

Postulates are assumed true and used to logically derive theorems and geometric properties.

Drawing maps, building structures, and creating technical diagrams involve Euclidean geometry.

It enables systematic reasoning and problem-solving in mathematics.

Practice textbook exercises, revise definitions, understand proofs, and solve sample questions.

Euclid’s systematic approach revolutionized mathematics and structured logical deduction.

It’s about learning the rules and relationships between basic shapes and figures through logical steps.

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