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Who proved that the interior angles of a triangle have a fixed sum?
APtolemy
BGalileo
CEuclid
DEuler
Answer & Solution
Correct answer: C. Euclid
1. It is one of the most important triangle properties.
2. The proof used parallel lines.
3. It was Euclid.
_Source: OpenStax, Contemporary Mathematics, Ch 10 'Geometry'_
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