5²ñ + 3n - 1 is an integer multiple of 9, for all positive integer value
f n​

The measure of three angles are .so the given triangle is acute.

Solution:  

From question, only measure of two angles of triangle are given. We have to find out the angle of third angle to determine the type of triangle.

We know that sum of all three angles in triangle is equal 180.

Given that two angle of triangle are .Consider the third angle is a, so

 [Angle Sum Property of triangle]

Hence all the three angles of triangle are less than \bold{}. Hence the triangle is acute.