The 3 vertices of a triangle when cut off will tessellate to form a straight line and angles on a straight line add up to 180 degrees or simply use a protractor to measure each angle.
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The angles of any triangle add up to 180 degrees.
There are 3 interior angles in a triangle and they add up to 180 degrees
The 3 interior angles of any triangle add up to 180 degrees
The sum of the angles of a triangle MUST add up to 180o.
The 3 interior angles of a triangle add up to 180 degrees