the triangle is acute.
Explanation:
Right angles are like a square with all 90° angles. Acute is like if you pinched the corners and made them smaller like 80° angles. Obtuse is like you bent the corners and made them 110° degree angles. Obtuse is like the top parts of a diamond acute it like the bottom part of the diamond. I like to think of it this way, right=square, obtuse=octogaon, acute=triangle. Not the best way to explain it but I hope this helps a little.