In the triangle $ABC$, the point $M$ is the midpoint of $[AB]$ and $D$ is the foot of the bisector of the angle $\angle ABC$. In addition  $MD \perp BD$.
a) Indicate how to construct (with a ruler and a compass) such a triangle.
b) Prove that $|AB|=3|BC|$.
c) Is the converse also true, i.e., the condition $MD\perp BD$  necessary for $|AB|=3|BC|$ ?
### (a) Construction of the triangle $ABC$:
1. **Construct segment $BO$**: Draw a line segment $BO$.
2. **Draw a circle with center $O$ and radius $BO$**: This circle will intersect the line $BO$ at some point $M$.
3. **Choose point $M$ on the circle**: Ensure that $\angle MDB = 90^\circ$.
4. **Draw line $BM$**: This will be one side of the triangle.
5. **Draw a circle with center $M$ and radius $BM$**: This circle will intersect the line $BM$ at point $A$.
6. **Draw line $MD$**: This line is perpendicular to $BD$.
7. **Draw a circle with center $B$ and radius $BM$**: This circle will intersect the line $MD$ at point $E$.
8. **Intersection of lines $BE$ and $AD$ is $C$**: This completes the triangle $ABC$.

Now, $M$ is the midpoint of $AB$, and since $BE = BM$ and $\angle MDB = 90^\circ$, $BD$ is the angle bisector of $\angle ABC$. All criteria are satisfied.

### (b) Prove that $|AB| = 3|BC|$:
1. **Denote $MD = DE$**: Let $J$ be a point on $AC$ such that $JD = DC$. Thus, $MJEC$ is a parallelogram.
2. **Angles in the parallelogram**:
   \[
   \angle JME = \angle MEB = \angle EMB \implies \angle AMJ = \angle ABC
   \]
   Thus, $MJ \parallel BC$, which by similarity gives us that $J$ is the midpoint of $AC$.
3. **Using the angle bisector theorem**:
   \[
   \frac{AB}{BC} = \frac{AD}{DC} = \frac{AJ + JD}{DC} = 3
   \]
   Therefore, $|AB| = 3|BC|$.

### (c) Converse: Is the condition $MD \perp BD$ necessary for $|AB| = 3|BC|$?
1. **Assume $|AB| = 3|BC|$**: We need to show that $MD \perp BD$.
2. **Since $MJ = CE$**: $MJ$ is the midline, thus $BE = BC + BJ = \frac{3BC}{2}$.
3. **Since $M$ is the midpoint of $AB$**: $AB = 3BC$, thus $BM = \frac{3BC}{2}$.
4. **Triangle $BME$ is isosceles**: Since $BD$ is the angle bisector of $\angle ABC$, we get that $\angle BDM = 90^\circ$, which is equivalent to $BD$ being perpendicular to $DM$.

Thus, the converse is also true.

The final answer is $\boxed{\text{Answer. Yes.}}$