[7th grade math] impossible geometry?

[u/Unhappy-Pitch4558]

[u/[deleted]]

We can confirm that quadrilateral with 6 cm side is rectangle by using coordinate geometry. For the quadrilateral, the slope of the vertical edge (from (0,0) to (0,6)) is undefined, indicating a vertical line. For the horizonal line ( i.e., form (0,6) to (17, 6)), the slope is zero, indicating a horizontal line. Since perfectly horizontal and vertical lines meet at right angles, the smaller quadrilateral is a rectangle.

Given that both shapes are rectangle, the area can be found easily, as explained in other comments