Which is a correct classification for the triangle?

right triangle

obtuse triangle

equiangular triangle

acute triangle

Here, two angles are: 31 & 59
Third angle = 180 - 31 - 59
= 180 - 90 = 90

As one angle is equal to 90, it would be right triangle

In short, Your Answer would be Option A

Hope this helps!

Ithink is the abswer b