Acute angle. (Hope You knew the rest of the answers on you homework!)
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That would be an acute angle.
102.8 degrees I think but it depends. If the angle is a central angle it is 51.4 degrees but other than that I think it would be 102.8 degrees.
They are: 75 degrees + 15 degrees = 90 degrees
An angle that is 47 degrees would be considered an "acute" angle. This is because its measurements do not exceed 90 degrees. Anything above 90 would be considered an "obtuse" angle.
An angle that is 129 degrees would be called an "obtuse" angle. This is because its measurements exceed 90 degrees but do not pass 180 which would be a straight line. Anything below 90 would be considered an "acute" angle.