Determine whether each statement is true or false. If it is false, provide a counterexample.
1.If a quadrilateral is equilateral, then it is equiangular.
2. If a quadrilateral is equiangular, then it is equilateral.
3. Every isosceles triangle has at least one line of symmetry.
4. Every equilateral triangle has exactly three lines of symmetry.
5. If two angles are not congruent, then the two angles are not right.
It will include more complex tasks to solve like congruence equation solving, which also becomes easier when you have a good example like what we provide.