No.
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Angles that add to 180 degrees are called supplementary angles, while angles that add to 90 degrees are called complentary angles.
No, the angles in a quadrilateral add up to 360 degrees. The angles in a triangle add up to 180 degrees.
The angles add up to 180 degrees, but the angles are 60 degrees.
The Interior angles of a triangle add up to 180° The Exterior angles of a triangle (or any other polygon) add up to 360°.
Two angles that share a common side and add up to 180 degrees are called right angles and are 90 degrees.