Euclid stated that all right angles are equal to each other in the form of:

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An axiom

A definition

A postulate

A proof

answer is C.

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Detailed Solution

Given that, all right angles are equal to each other.
Axioms is a statement that is always true, which used for further reasoning.
Definitions is a statement meaning of the term, it defines clearly something.
Postulate is a basis for reasoning which is already suggested to be true.
Proof is a evidence of something which is true.
As we know that from Euclid fourth postulate - All right angle is equal to each other.
That is, every right angle is congruent.
It means one line is perpendicular to other line can help to make a right angle, and makes one angle equal to other, every right angle is therefore equal to each other.
Hence, this is stated in postulate.
Therefore, option (3) is correct.

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