Answer:
number 7:Sometimes We can have two acute angles, 20 and 30, 20+30=50, which is still acute,
We can have two acute angles, 45 and 45, 45+45=90, which is neither acute nor obtuse.
We can have two acute angles, 80 and 80, 80+80=160, which is obtuse.acute angles are less than 90 degrees. However, they can sometimes equal obtuse angles. For example, two acute angles measures of 70 degrees and 30 degrees are both acute. Add them together they equal 100 degrees, which is obtuse. some examples: 40° and 30° are acute angles 40° + 30° = 70°, which is an acute angle 60° and 30° are acute angles 60° + 30° = 90°, which is a right angle 50° and 70° are acute angles 50° + 70° = 120°, which is an obtuse angle.
number 8 :Since the intercepted arc LN is the diameter of the circle, its measure is 180 degrees, so m<LMN = 90
Conclusion: the sum of two acute angles is sometimes an acute angle.
