The angles of any triangle add up to 180 degrees.
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The 3 interior angles of any triangle add up to 180 degrees.
One of the triangle's angles is 90 degrees (a rightangle) and the two others are both 45 degrees. The three angles in a triangle must always (and will) add up to 180 degrees.
The sum of the angles of a triangle MUST add up to 180o.
The 3 interior angles of any triangle add up to 180 degrees
The 3 interior angles of a triangle add up to 180 degrees