The sum of the 3 interior angles of any triangle add up to 180 degrees
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It is the sum of the lengths of its sides.
90° . That's true of any triangle. Doesn't have to be isosceles.
The perimeter of any triangle is the sum of its 3 sides.
the sum of the internal angles of a triangle, no matter whether isosceles, equilateral or scalene, is always 180 degrees
Yes