obtuse
Actually it could be acute, right, and/or obtuse.. if that makes sense..
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The sum of two acute angles is sometimes an obtuse angle because, acute angles can measure from 10 to 90 degrees. Two 30 degree angles would both be acute whose sum would only create another acute angle of 60 degrees. But, two80 degree angles would both be acute angle whose sum would only create an obtuse angle.
A right angle triangle
A triangle can have one obtuse angle and two acute angles. The sum of all three angles must equal 180 degrees.
In Euclidean geometry a right angle triangle has two acute angles. All others have three.
No, in fact no triangle can have two right angles. The sum of all interior angles of any triangle is 180 degrees. All triangles must have three angles. A right angle is 90 degrees. So if a triangle has two ninety degree angles, there would be no third angle. An acute triangle has all three angles less than 90 degrees. The most common acute triangle is the equilateral 60-60-60 degree triangle.