Class IX Mathematics

Chapter 5: Introduction to Euclid's Geometry

Standard NCERT & CBSE aligned study curriculum. Master concepts, track accuracy, revise weak areas, and challenge yourself with 9 customized practice modes.

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Worksheet Details:

  • Title: Class IX Math: Introduction to Euclid's Geometry Printable Sheet
  • Format: Print Optimized CSS stylesheet
  • Sections: Formulas checklist, 5 assessment questions, worked keys

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Class IX Mathematics: Introduction to Euclid's Geometry

Name: ______________________Date: __________________Score: ______ / 5

Section I: Key Formulas

Euclid Axiom 1
A = B \land B = C \Rightarrow A = C

Section II: Answer the Questions

1. In the given figure, if 2 = 4 and 4 = 1, then using Euclid’s axiom prove that 1 = 2.

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2. Does Euclid’s fifth postulate imply the existence of parallel lines? Explain.

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3. Prove that "If two lines intersect each other, then the vertically opposite angles are equal." Using this theorem, find all the angles if ∠ POR : ∠ ROQ = 5 : 7 in the below figure where lines PQ and RS intersect each other at point O.

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4. In the given figure, we have ∠1 = ∠ 2, ∠ 3 = ∠ 4. Show that ∠ ABC = ∠ DBC. State the Euclid’s axiom used.

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5. In the figure, we have: AC = XD, C is the midpoint of AB and D is the mid-point of XY. Using an Euclid’s axiom, show that AB = XY.

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