Final answer:
Triangles cannot have more than one right angle due to angle sum properties.
Explanation:
True. A triangle cannot have more than one right angle. In any triangle, the sum of angles is 180 degrees, and if there were two right angles, the third angle would be 0 degrees, violating the triangle sum theorem.
Legendre proved that the sum of angles of a triangle cannot exceed two right angles, ensuring that no triangle can have more than one right angle.
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