To determine the type of triangle based on its angles, we can classify it as follows:
- An acute triangle has all angles less than 90°.
- A right triangle has one angle that measures exactly 90°.
- An obtuse triangle has one angle that is more than 90°.
In the given triangle, the angles are 46°, 51°, and 83°. All of these angles are less than 90°, which makes the triangle an acute triangle.
So, the correct response is acute triangle.