Let $ABCD$ be a cyclic quadrilateral, and $E$ be the intersection of its diagonals. If $m(\widehat{ADB}) = 22.5^\circ$, $|BD|=6$, and $|AD|\cdot|CE|=|DC|\cdot|AE|$, find the area of the quadrilateral $ABCD$.
1. **Identify the given information and notation:**
   - $ABCD$ is a cyclic quadrilateral.
   - $E$ is the intersection of its diagonals.
   - $m(\widehat{ADB}) = 22.5^\circ$.
   - $|BD| = 6$.
   - $|AD| \cdot |CE| = |DC| \cdot |AE|$.
   - Let $CD = a$, $DA = b$, $AB = c$, and $BC = d$.

2. **Use the given condition $|AD| \cdot |CE| = |DC| \cdot |AE|$:**
   - This implies that $DB$ is the angle bisector of $\angle ADC$ by the Angle Bisector Theorem.

3. **Determine the angles:**
   - Since $DB$ is the angle bisector of $\angle ADC$, we have $\angle ADC = 2 \times 22.5^\circ = 45^\circ$.
   - Since $ABCD$ is a cyclic quadrilateral, the opposite angles sum to $180^\circ$. Therefore, $\angle ABC = 180^\circ - \angle ADC = 180^\circ - 45^\circ = 135^\circ$.

4. **Use the Law of Cosines in $\triangle ABD$ and $\triangle CBD$:**
   - In $\triangle ABD$:
     \[
     BD^2 = AD^2 + AB^2 - 2 \cdot AD \cdot AB \cdot \cos(22.5^\circ)
     \]
   - In $\triangle CBD$:
     \[
     BD^2 = CD^2 + CB^2 - 2 \cdot CD \cdot CB \cdot \cos(22.5^\circ)
     \]
   - Since $BD = 6$, we have:
     \[
     6^2 = AD^2 + AB^2 - 2 \cdot AD \cdot AB \cdot \cos(22.5^\circ)
     \]
     \[
     6^2 = CD^2 + CB^2 - 2 \cdot CD \cdot CB \cdot \cos(22.5^\circ)
     \]

5. **Solve for $a$ and $b$:**
   - Let $a = CD$ and $b = DA$.
   - The equations become:
     \[
     36 = b^2 + c^2 - 2bc \cos(22.5^\circ)
     \]
     \[
     36 = a^2 + d^2 - 2ad \cos(22.5^\circ)
     \]
   - Since $c = d$ (as $c = d$ from the problem statement), we can simplify:
     \[
     36 = b^2 + c^2 - 2bc \cos(22.5^\circ)
     \]
     \[
     36 = a^2 + c^2 - 2ac \cos(22.5^\circ)
     \]

6. **Find the area of the quadrilateral:**
   - The area of a cyclic quadrilateral can be given by Brahmagupta's formula:
     \[
     \text{Area} = \sqrt{(s-a)(s-b)(s-c)(s-d)}
     \]
     where $s = \frac{a+b+c+d}{2}$.
   - However, we can use the given angles and sides to find the area directly:
     \[
     \text{Area} = \frac{1}{2} \cdot (ab + cd) \cdot \sin(45^\circ)
     \]
   - Since $c = d$ and $ab = 36 - c^2$:
     \[
     \text{Area} = \frac{1}{2} \cdot (36 - c^2 + c^2) \cdot \sin(45^\circ)
     \]
     \[
     \text{Area} = \frac{1}{2} \cdot 36 \cdot \frac{\sqrt{2}}{2}
     \]
     \[
     \text{Area} = 9\sqrt{2}
     \]

The final answer is $\boxed{9\sqrt{2}}$