The star shown is symmetric with respect to each of the six diagonals shown. All segments connecting the points $A_1, A_2, . . . , A_6$ with the centre of the star have the length $1$, and all the angles at $B_1, B_2, . . . , B_6$ indicated in the figure are right angles. Calculate the area of the star.
[img]https://1.bp.blogspot.com/-Rso2aWGUq_k/XzcAm4BkAvI/AAAAAAAAMW0/277afcqTfCgZOHshf_6ce2XpinWWR4SZACLcBGAsYHQ/s0/2006%2BMohr%2Bp1.png[/img]
1. **Identify the Geometry and Symmetry:**
   The star is symmetric with respect to each of the six diagonals. Each segment connecting the points \( A_1, A_2, \ldots, A_6 \) with the center \( O \) of the star has a length of 1. All the angles at \( B_1, B_2, \ldots, B_6 \) are right angles.

2. **Determine the Angles:**
   Since the star is symmetric and has six points, the angle between each segment \( A_iO \) and \( A_{i+1}O \) is \( \frac{360^\circ}{6} = 60^\circ \). Therefore, the angle \( \angle A_iOB_i = 30^\circ \) because \( B_i \) is the midpoint of the arc between \( A_i \) and \( A_{i+1} \).

3. **Use Law of Sines (LOS):**
   In triangle \( A_iOB_i \), we know:
   - \( \angle A_iOB_i = 30^\circ \)
   - \( \angle A_iB_iO = 135^\circ \) (since \( \angle B_i = 90^\circ \) and \( \angle A_iOB_i = 30^\circ \))

   Using the Law of Sines in \( \triangle A_iOB_i \):
   \[
   \frac{A_iB_i}{\sin(135^\circ)} = \frac{1}{\sin(30^\circ)}
   \]
   \[
   \frac{A_iB_i}{\frac{\sqrt{2}}{2}} = \frac{1}{\frac{1}{2}}
   \]
   \[
   A_iB_i = 2\sqrt{2}
   \]

4. **Calculate the Area of \( \triangle A_iB_iO \):**
   The area of \( \triangle A_iB_iO \) can be calculated using the formula for the area of a triangle:
   \[
   \text{Area} = \frac{1}{2} \times \text{base} \times \text{height}
   \]
   Here, the base \( A_iB_i = 2\sqrt{2} \) and the height is the perpendicular distance from \( O \) to \( A_iB_i \), which is \( \sin(30^\circ) \times 1 = \frac{1}{2} \).

   Therefore, the area of \( \triangle A_iB_iO \) is:
   \[
   \text{Area} = \frac{1}{2} \times 2\sqrt{2} \times \frac{1}{2} = \frac{\sqrt{2}}{2}
   \]

5. **Calculate the Total Area of the Star:**
   Since there are 12 such triangles in the star (each \( A_iB_iO \) is repeated twice for each of the 6 points):
   \[
   \text{Total Area} = 12 \times \frac{\sqrt{2}}{2} = 6\sqrt{2}
   \]

The final answer is \(\boxed{6\sqrt{2}}\)