If you mean only 1 acute angle, then no. The 3 interior angles in any triangle add up to exactly 180°. If one of the angles is greater than or equal to 90°, then the other two angles must add up to be less than or equal to 90° (which means that both of them have to be acute angles).
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no
Yes. In this case a triangle is called an acute triangle.
A right triangle has one angle a right angle (90o) An obtuse triangle has one angle an obtuse angle (> 90o) An acute triangle has all angles acute (< 90o)
One acute angle
No. An acute triangle has to have three acute angles. A right triangle has to have one 90 degree angle.