Axioms are the general statements, postulates are the axioms relating to a particular field.
(2) Statements : A sentence which is either true or false but not both, is called a statement.
eg. (i) 4+9=6 it is a false sentence, so it is a statement.
(ii) Sanjay is tall. This is not a statement because he may be tall for certain persons and may not be taller for others.
(3) Theorems: A statement that requires a proof is called a theorem.
eg. (i) The sum of the angles of triangle is 1800.
(ii) The angles opposite to equal sides of a triangles are equal.
Corollary - Result deduced from a theorem is called its corollary.
(4) Postulates :- The basic assumptions in geometry which are universal true and are accepted without proof are called Postulates.
(5) Euclid's five postulates are.
(i) A straight line may be drawn from any one point to any other point.
(ii) A terminated line can be produced indefinitely.
(iii) A circle can be drawn with any centre and any radius.
(iv) All right angles are equal to one another.
(v) If a straight line falling on two straight lines makes the interior angles on the same side of it taken together less than two right angles, then the two straight lines, if produced indefinitely meet on that side on which the angles are less than two right angles.
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