Euclid stated that all right angles are equal to one another in the form of a/an

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Axiom

Definition

Postulate

Proof

answer is C.

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Detailed Solution

It is given that Euclid stated that all right angles are equal to one another.
We know that, postulates are,

A straight line may be drawn from any point to any other point.

A terminated line (line segment) can be produced indefinitely.

A circle may be described with any center and any radius.

All right angles are equal to one another.

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 the two straight lines, if produced indefinitely, meet on that side on which the sum of angles is taken together less than two right angles.

Euclid used the term postulate for the assumptions that were specific to geometry
and otherwise called axioms.
A theorem is a mathematical statement whose truth has been logically established.
So, Euclid stated the given statement in the form of a postulate.
So, the correct option is 3.

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