Which of the following sentences are statements? Give reasons for your answer.
"The sides of a quadrilateral have equal length."

(N/A) sentence is considered a statement in mathematical logic if it is either always true or always false.
The given sentence,"The sides of a quadrilateral have equal length," is ambiguous because its truth value depends on the specific type of quadrilateral.
For example,in a square or a rhombus,all sides are equal,making the statement true.
However,in a rectangle or a trapezium,the sides are not necessarily equal,making the statement false.
Since the sentence can be true or false depending on the context,it is not a mathematical statement.