The sum of the interior angles of a triangle on a plane is always 180 degrees.
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An interior angle is any angle on the interior of the triangle.
It will have 3 interior angles of 60 degrees that add up to 180 degrees and it is an equilateral triangle.
two opposite interior angles.
180 degrees because the 4 interior angles of a quadrilateral add up to 360 degrees and the 3 interior angles of a triangle add up to 180 degrees
A right angle triangle has a 90 degree angle and its other two angles add up to 90 degrees