if the shape is a true rectangle, the triangles that the length and the width makes with the diagonal (ADB and CDB) are right triangles.Therefore, it must satisfy the Pythagorean Theorem.
[tex]c^2=a^2+b^2[/tex]when a = 36 and b = 18, c which is x must be 54 according to the probem, we can verify if that is true.
[tex]\begin{gathered} c^2=a^2+b^2 \\ x^2=36^2+18^2 \\ x^2=1296+324 \\ x^2=1620 \\ x=40.25 \end{gathered}[/tex]Thus, x is not equal to 54 but 40.25. Therefore, the answer is No, since 36^2 +18^2 is not equal to 54^2 then ADB and CDB cannot be right triangles.
Answer: D