The sum of the three angles of a triangle is always 180º
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No because the three interior angles of any triangle always add up to 180 degrees.
The three angles included in the triangle adds up to 180 degrees.
A triangle has three sides and three angles that total 180 degrees.
Since the definition of an equilateral triangle is "a triangle with three equal sides", it must therefore also have three equal angles. Since the angles in any triangle add up to 180 degrees, each of those angles is 60 degrees.
An obtuse triangle does not always have three congruent sides. An obtuse triangle can be any form that always has three angles.