Each cell of a beehive is constructed from a right regular 6-angled prism, open at the bottom and closed on the top by a regular 3-sided pyramidical mantle. The edges of this pyramid are connected to three of the rising edges of the prism and its apex $T$ is on the perpendicular line through the center $O$ of the base of the prism (see figure). Let $s$ denote the side of the base, $h$ the height of the cell and $\theta$ the angle between the line $TO$ and $TV$.

(a) Prove that the surface of the cell consists of 6 congruent trapezoids and 3 congruent rhombi.
(b) the total surface area of the cell is given by the formula $6sh - \dfrac{9s^2}{2\tan\theta} + \dfrac{s^2 3\sqrt{3}}{2\sin\theta}$

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### Part (a): Prove that the surface of the cell consists of 6 congruent trapezoids and 3 congruent rhombi.

1. **Hexagonal Prism Base and Pyramid Mantle:**
   - The base of the cell is a regular hexagon with side length \( s \).
   - The top of the cell is closed by a regular 3-sided pyramidical mantle with apex \( T \).

2. **Rhombus Formation:**
   - Consider the quadrilateral \( TUVW \) formed by connecting the apex \( T \) to three vertices \( U, V, W \) of the hexagon.
   - The diagonals \( UW \) and \( TV \) intersect at point \( P \).
   - Since \( UW \) and \( TV \) are diagonals of the rhombus \( TUVW \), they bisect each other at right angles.
   - The rhombus \( TUVW \) is congruent to the other two rhombi \( TWXY \) and \( TYZU \) due to the 3-fold rotational symmetry of the structure.

3. **Trapezoid Formation:**
   - The sides of the hexagon are connected to the apex \( T \) forming trapezoids.
   - For example, \( ABVU \) is a trapezoid where \( AB \) is a side of the hexagon and \( UV \) is a side of the rhombus \( TUVW \).
   - The trapezoids \( ABVU, CBVW, \) and the remaining four trapezoids are congruent due to the symmetry of the hexagon and the structure.

Thus, the surface of the cell consists of 6 congruent trapezoids and 3 congruent rhombi.

### Part (b): Derive the total surface area formula

1. **Height Calculation:**
   - Let \( O \) be the center of the hexagon and \( Q \) be the circumcenter of the equilateral triangle \( \triangle UWY \).
   - From the right triangle \( \triangle TPQ \), where \( PQ = \frac{s}{2} \) and \( \angle PQT = 90^\circ \), we have:
     \[
     TQ = \frac{PQ}{\tan \theta} = \frac{s}{2 \tan \theta}
     \]
   - The longer base \( h_1 \) of the trapezoid is:
     \[
     h_1 = TO - TQ = h - \frac{s}{2 \tan \theta}
     \]
   - The shorter base \( h_2 \) of the trapezoid is:
     \[
     h_2 = TO - 2TQ = h - \frac{s}{\tan \theta}
     \]

2. **Area of Trapezoid:**
   - The area \( S_T \) of one trapezoid is:
     \[
     S_T = \frac{h_1 + h_2}{2} \cdot s = \left(h - \frac{3s}{4 \tan \theta}\right) \cdot s = sh - \frac{3s^2}{4 \tan \theta}
     \]

3. **Diagonals of Rhombus:**
   - The hypotenuse \( TP \) of the right triangle \( \triangle TPQ \) is:
     \[
     TP = \frac{PQ}{\sin \theta} = \frac{s}{2 \sin \theta}
     \]
   - The diagonals of the rhombus \( TUVW \) are:
     \[
     d_1 = UW = s \sqrt{3}
     \]
     \[
     d_2 = TV = 2TP = \frac{s}{\sin \theta}
     \]

4. **Area of Rhombus:**
   - The area \( S_R \) of one rhombus is:
     \[
     S_R = \frac{d_1 \cdot d_2}{2} = \frac{s^2 \sqrt{3}}{2 \sin \theta}
     \]

5. **Total Surface Area:**
   - The total surface area \( S \) of the cell is:
     \[
     S = 6S_T + 3S_R = 6 \left(sh - \frac{3s^2}{4 \tan \theta}\right) + 3 \left(\frac{s^2 \sqrt{3}}{2 \sin \theta}\right)
     \]
     \[
     S = 6sh - \frac{9s^2}{2 \tan \theta} + \frac{3s^2 \sqrt{3}}{2 \sin \theta}
     \]

The final answer is \( \boxed{ 6sh - \frac{9s^2}{2 \tan \theta} + \frac{3s^2 \sqrt{3}}{2 \sin \theta} } \).