Don't be obtuse... You can't.
As you may recall the sum of the interior angles in any triangle is 180 degrees.
The definition of an acute angle is an angle less than 90 degrees.
If only one angle in a triangle is less than 90 degrees, the other two must therefore be 90 degrees or more, and their sum would then be 180 degrees, or more. For the sum of all three to be exactly 180 degrees, the acute angle would have to be 0 degrees or less, and the practical effect of that observation is that it can't exist.
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no, it is impossible
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
Yes providing that the other two angles are acute