Question

how to find an angle is obtuse or acute​

Answer 1

by measuring the angle by using protactor.
if it is less than 90 degree then it is an acute angle.
if it is more than 90 degree and less than 120 degree then it is obtuse angle

Answer 2

Here is your answer

If an angle is less than 90 degree and more than 0 degree , then it is an acute angle .

If an angle is less than 180 degree and more than 90 degree , then it is an obtuse angle

by using protector