all of the angles in a triangle add up to 180 degrees
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Each triangle has 180 degrees on the inside angles.
The 3 inside angles of a triangle add up to 180 degrees
The three angles inside the triangle add up to 180 degrees.
The three angles inside a triangle always add up to exactly 180 degrees,no matter what kind of a triangle it is.
The three angles inside any triangle always add up to 180 degrees.If one of them is 90 degrees, then the triangle is a right triangle.