They are possible - unlike plane triangles in which all of the angles are right angles, obtuse or larger.
Chat with our AI personalities
An acute triangle.
No. By definition, an acute triangle is a triangle where all three angles are <90 degrees. Therefore, an equilateral triangle, where all the angles are 60 degrees would qualify as an acute triangle.
In an equilateral triangle, all of the angles are equal, which makes them all 60 degrees. Therefore, all three angles are acute.
An acute angled triangle.
It is an acute triangle and if the acute angles are of different sizes then it is a scalene triangle.