Because a triangle is half of a square or rectangle. Since there are 360 degrees in all the angles of a square, there will be 180 degrees in a triangle.
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There are 3 angles in a triangle that add up to 180 degrees.
An equilateral triangle has 3 equal inside angles that add up to 180 degrees.
The three interior angles of every triangle always add up to 180 degrees. If all of them are the same measure, then each one must be 180/3 = 60 degrees.
the sum of the interior angles in a triangle is 180 degrees.
The internal angles of a triangle always add up to 180 degrees.