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Definition of Postulate

Postulate is a true statement, which does not require to be proved.

More About Postulate

Postulate is used to derive the other logical statements to solve a problem.
Postulates are also called as axioms.

Example of Postulate

 example of  Postulate

To prove that these triangles are congruent, we use SSS postulate, as the corresponding sides of both the triangles are equal.

Video Examples: The five postulates of Euclidean Geometry

Solved Example on Postulate

Ques: State the postulate or theorem you would use to prove that ∠1 and ∠2 are congruent.

 example of  Postulate

  • A. corresponding angles postulate
  • B. converse of corresponding angles postulate
  • C. alternate angles are congruent
  • D. adjacent angles are congruent

Correct Answer: A


  • Step 1: ∠1 and ∠2 corresponding angles.
  • Step 2: Since the lines a and b are parallel, ∠1 and ∠2 are congruent. [Corresponding angles postulate.]
  • Step 3: So, corresponding angles postulate is used to prove that ∠1 and ∠2 are congruent.

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