Euclid stated that all right angles are equal to each other in the form of
(A) an axiom
(B) a definition
(C) a postulate
(D) a proof
(C) a postulate
Solution:
Euclid gave us five postulates.
Postulate: to accept or guarantee as true, whether it is existent, or necessary.
According to Euclid’s fourth postulate, all right angles are equal to each other.
Hence, Euclid’s statement “all right angles are equal to each other” is in the form of a postulate.
Option (C) is correct.