Question

determine whether the statement is a good definition. if not, give a specific counterexample. (#13 - 14) 13. a square is a four - sided figure. 14. a quarter is a coin worth twenty - five cents.

Explanation:

1. A square is not well - defined just as a four - sided figure. A rhombus is also a four - sided figure but not a square. A square is a four - sided figure with all sides equal and all angles equal to 90 degrees. So this is not a good definition.
2. A quarter is indeed a coin worth twenty - five cents, so this is a good definition.

Answer:

1. No, counterexample: rhombus
2. Yes