Fill in the blanks in each of the following, so as to make the statement true: A rectangle is a parallelogram in which.... A square is a rhombus in which.... A square is a rectangle is which....

Explanation

A rectangle is a parallelogram in which opposite sides are parallel and equal.
A square is a rhombus in which all the sides are of equal length.
A square is a rectangle in which opposite sides are equal and parallel and each angle is a right angle.