Which statements are not true?

all rhombuses have only one pair of sides of the same length.
all rhombuses have right angles.
all rhombuses have two sets of parallel sides.
all rhombuses have four sides of the same length.

All rhombuses have four sides of the same length is the statement that is not true.

Explanation:

Rhombuses only have two sets of the same length. If it had four sides of the same length, it would actually be called a square. A square has 4 sides of the same length and is the only polygon that can be described as such.

the answer is d (apex) good luck : ))