From experience this is an acute triangle. to prove it you would have to use the Law of Cosines to prove each angle is acute.
Each angle would follow the formula:
Angle A = ArcCos((b^2+c^2-a^2)/(2bc))
A = 44.4 degrees
B = 57.1 degrees
C = 90 - A - B = 78.5 degrees
