<h2>
Answer:</h2>
The negation of the given statement is:
A parallelogram has four congruent sides and it is not a rhombus.
<h2>
Step-by-step explanation:</h2>
We know that for any conditional statement of the type:
If p then q
where p is the hypotheses and q is the conclusion then the negation of the statement is given by:
p and not q.
Here we are given a conditional statement as:
"If a parallelogram has four congruent sides then it is a rhombus".
Hence, the negation of this statement will be:
A parallelogram has four congruent sides and it is not a rhombus.
