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It is: 11 degrees
The angle of the sector measures 39.6 degrees (.11*360).
A 45-degree angle is an acute angle
A 90 degree angle is a right angle
If the triangle has a 30 degree angle and a 60 degree angle then the 3rd angle must be a 90 degree angle because there are 180 degrees in a triangle and so therefore it is a right angle triangle.