Question

multiple choice 1 point
determine which is a good definition:
a triangle is a closed three sided figure.
a banana is a fruit.
a square is a closed four sided figure.
none of the above.

Explanation:

A good definition must be precise, necessary, and sufficient. Option A defines a triangle as a "closed three-sided figure," which captures its essential properties (3 sides, closed) uniquely. Option B is too broad (banana is a type of fruit, not all fruits). Option C is too general (square requires equal sides/angles, not just 4 sides). Thus, A is a good definition.

Answer:

A. A triangle is a closed three sided figure.