No, but 75 degrees is an acute angle.
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acute-angled triangle
The question appears to relate to the angles of a triangle. 1) If angle 3 is acute then the other two angles can also be acute. In the case of an equilateral triangle all three angles are equal and acute. 2) If angle 3 is acute and one other angle is obtuse then the remaining angle is acute. 3) If angle 3 is acute and one other angle is a right angle then the remaining angle is acute.
Yes . Triangle have right acute and obtuse angle except compelete angle.
An acute angle
yes because if you flip the acute angle it is possibe