Yes
Total of angles add up to 180, and all angles are below 90 degrees
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Yes it can.
A scalene triangle is one where each side is a different length. Acute means that the largest interior angle of the triancle is less than 90 degrees A triangle is one of the basic shapes of geometry: a polygon with three corners or vertices and three sides or edges which are line segments. A triangle with vertices A, B, and C is denoted Triangle (Trigon) ABC. Scalene triangle is a triangle in which all the sides of the triangle will be unequal. The angles of triangle will be unequal. In the above triangle, the sides of the triangle are 8 cm, 10 cm, and 16 cm. The Scalene Triangle has no congruent sides. The Acute Triangle has three acute angles (an acute angle measures less than 90°) Scalene triangles are unusual in that the are defined by what they are not. Most triangles drawn at random would be scalene. The interior angles of a scalene triangle are always all different. The converse of this is also true - If all three angles are different, then the triangle is scalene, and all the sides are different lengths.
No, not in plane (Euclidean) geometry.
The Sum of the angles of a triangle drawn on a plain surface. is 180 degrees. However, the sum of the angles of a triangle drawn on a curved surface, such as a sphere ( the Earth) can be greater than 180 degrees.
3 and they add up to 360 degrees