Question

which shape is a rhombus?

Explanation:

A rhombus is a parallelogram with all sides equal. A rectangle (first shape) has four right - angles and opposite sides equal. A square (second shape) is a special case of a rhombus with four right - angles. A trapezoid (third shape) has only one pair of parallel sides. The fourth shape is a parallelogram with all sides equal (by the property of a rhombus: a parallelogram with equal - length sides).

Answer:

The fourth shape (the parallelogram - like shape at the bottom) is a rhombus.