No because a triangle must have at least 2 acute angles along with a 3rd angle in which all 3 angles must add up to 180 degrees.
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No, not in plane (Euclidean) geometry.
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.