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The mathematician often credited with discovering the properties of triangles, particularly their angles, is Euclid. In his work "Elements," he established foundational principles of geometry, including the sum of the interior angles of a triangle being 180 degrees. This insight laid the groundwork for further developments in geometry and remains a fundamental concept in mathematics today.
no one is given the credit of discovering maths
It is an obtuse or scalene triangle having the given angles
It is an isosceles triangle and the 3rd angle is 72 degrees.
It is an isosceles right angle triangle if the given numbers are in degrees