a^2 + b^2=c^2
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Triangle = sum of its 3 sides Square = sum of its 4 sides Rectangle = sum of its 4 sides
It is the perimeter of the triangle.
The perimeter of a triangle is the sum of its 3 sides
The perimeter of a triangle is the sum of its 3 sides
The sum of the interior angles of any triangle is 180 degrees. The sum of the exterior angles of any triangle is 360 degrees. Concerning the sum of the sides, that depends on the triangle. If it happens to be an equilateral one, then the sum of the sides is three times the length of one side.