Question

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

Answer 1

Euclid stated that all right angles are equal to each other in the form of a postulate. Euclid's postulate 4 states that all right angles are equal to one another.

Hence, the correct answer is option (c).