The area of the trapezoid in the diagram is 9 cm².
Calculate the length of the line marked in red.
The area of the trapezoid in the diagram is 9 cm².
Calculate the length of the line marked in red.
For this trapezoid problem, the necessary dimensions to determine the length of the red line are insufficient due to missing base lengths. Since no complete base information or relevant assumptions are available to resolve this, we cannot calculate the red line length.
Therefore, the problem concludes as per option choice: It is impossible to calculate.
It is impossible to calculate.