To classify the triangle based on its angles:
- An acute triangle has all angles less than 90°.
- A right triangle has one angle exactly equal to 90°.
- An obtuse triangle has one angle greater than 90°.
The angles given are 46°, 51°, and 83°.
Since all these angles are less than 90°, the triangle is classified as an acute triangle.
So, the correct response is:
acute triangle