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Euclid's fifth postulate is
Two distinct intersecting lines cannot be parallel to the same line.
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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