In which of the following forms did Euclid state that all right angles

1.	In which of the following forms did Euclid state that all right angles are equal to each other?
A.	An axiom
B.	A definition
C.	A postulate
D.	A proof
Answer» D. A proof

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In which of the following forms did Euclid state that all right angles are equal to each other?

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