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Euclid's fifth postulate is
Attempts to prove Euclid's fifth postulate using the other postulates and axioms led to the discovery of several other geometries.
Study the following statement: "Two intersecting lines cannot be perpendicular to the same line". Check whether it is an equivalent version to the Euclid's fifth postulate.
In Fig. 1, according to Euclid's 5th postulate, the pair of angles, having the sum less than 180° is:
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