The figure is a parallelogram. One diagonal measures 28 units.

A parallelogram is shown. It has side lengths 21, 20, 21, and 20. The length of a diagonal is 28.

Is the figure a rectangle? Explain.

Which shows the pre image of triangle xyz

These box plots show the number of electoral votes one by democratic and republican presidential candidates for the elections from 1984 through 2012. which statement best compares the spread of the data sets

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.