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Explanation:
1. An obtuse angle is an angle that is greater than 90 degrees but less than 180 degrees.
2. 5x - 8 = 37 if and only if x = 9.
3. If two angles have the same measure, then they are congruent. If two angles are not congruent, then they do not have the same measure. If two angles do not have the same measure, then they are not congruent.
4. 2x + 5 = 3 , then x = 3
5. With 3 equal sides is a equilateral triangle