To determine the type of triangle based on its angles, we can analyze the given angles:
- The angles of the triangle are 46°, 51°, and 83°.
Here are the classifications based on angle measurements:
- Acute Triangle: All angles are less than 90°.
- Right Triangle: One angle is exactly 90°.
- Obtuse Triangle: One angle is greater than 90°.
In this case, all angles (46°, 51°, and 83°) are less than 90°. Therefore, this triangle is classified as an acute triangle.
So the answer is: acute triangle.