The 3 interior angles in any triangle add up to 180 degrees.
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an angle that forms a linear pair with one of the interior angles of the triangle.
In geometry, an angle is the figure formed by two rays sharing a common endpoint, called the vertex.A triangle is a geometric shape formed by three angles ("triangle" from the words "tri" and "angle" literally meaning "THREE ANGLES")
If triangle has one obtuse angle other two angles are acute. Since, sum of angles of triangle is 180.
The 3rd angle is 80 degrees
If Y is the right angle then the third angle is indeterminate. Otherwise it is 90 - Y degrees.