Geometry

Question Analysis:
This question requires calculating the third angle of a triangle to determine if it is acute, right, or obtuse.
The main focus is on using the Triangle Sum Theorem.

Key Concept Explanation:
The Triangle Sum Theorem states: Sum of all angles = 180°
Right Triangle: One angle is 90°.
Obtuse Triangle: One angle is greater than 90°.
Acute Triangle: All angles are less than 90°.

Step-by-Step Solution:
Calculate the third angle:

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