Four circles of radius $1$ with centers $A,B,C,D$ are in the plane in such a way that each circle is tangent to two others. A fifth circle passes through the center of two of the circles and is tangent to the other two.
Find the possible values of the area of the quadrilateral $ABCD$.
1. **Identify the Geometry of the Problem:**
   - We have four circles of radius \(1\) with centers \(A, B, C, D\) such that each circle is tangent to two others.
   - This implies that the distance between any two adjacent centers is \(2\) (since the sum of the radii of two tangent circles is \(1 + 1 = 2\)).
   - Therefore, the quadrilateral \(ABCD\) is a rhombus with side length \(2\).

2. **Case 1: Fifth Circle Passes Through Two Adjacent Centers (e.g., \(A\) and \(B\)):**
   - The fifth circle passes through \(A\) and \(B\) and is tangent to the circles centered at \(C\) and \(D\).
   - The center of the fifth circle must lie on the perpendicular bisector of \(AB\) and \(CD\).
   - Since \(AB\) and \(CD\) are parallel, the perpendicular bisectors are the same line.
   - This implies that \(ABCD\) must be a square (since the perpendicular bisectors of a rhombus intersect at the center only if it is a square).
   - The side length of the square is \(2\), so the area of \(ABCD\) is:
     \[
     \text{Area} = 2^2 = 4
     \]

3. **Case 2: Fifth Circle Passes Through Two Opposite Centers (e.g., \(A\) and \(C\)):**
   - The fifth circle passes through \(A\) and \(C\) and is tangent to the circles centered at \(B\) and \(D\).
   - The center of the fifth circle must lie on the perpendicular bisector of \(AC\) and \(BD\), which intersect at the center \(E\) of the rhombus.
   - Let the radius of the fifth circle be \(r\). Then \(EA = EC = r\).

4. **Subcase 2.1: Fifth Circle is Externally Tangent to Circles at \(B\) and \(D\):**
   - The distance from \(E\) to \(B\) and \(D\) is \(1 + r\).
   - Using the Pythagorean theorem in \(\triangle EAB\):
     \[
     r^2 + (1 + r)^2 = 4
     \]
     \[
     r^2 + 1 + 2r + r^2 = 4
     \]
     \[
     2r^2 + 2r + 1 = 4
     \]
     \[
     2r^2 + 2r - 3 = 0
     \]
     \[
     r^2 + r - \frac{3}{2} = 0
     \]
     Solving this quadratic equation:
     \[
     r = \frac{-1 \pm \sqrt{1 + 6}}{2} = \frac{-1 \pm \sqrt{7}}{2}
     \]
     Since \(r\) must be positive:
     \[
     r = \frac{\sqrt{7} - 1}{2}
     \]
   - The area of \(ABCD\) remains the same as it is still a rhombus with side length \(2\):
     \[
     \text{Area} = 2 \times 2 \times \sin(60^\circ) = 2 \times 2 \times \frac{\sqrt{3}}{2} = 2\sqrt{3}
     \]
     However, since the side length is \(2\), the area is:
     \[
     \text{Area} = 2 \times 2 = 4
     \]

5. **Subcase 2.2: Fifth Circle is Internally Tangent to Circles at \(B\) and \(D\):**
   - The distance from \(E\) to \(B\) and \(D\) is \(r - 1\).
   - Using the Pythagorean theorem in \(\triangle EAB\):
     \[
     r^2 + (r - 1)^2 = 4
     \]
     \[
     r^2 + r^2 - 2r + 1 = 4
     \]
     \[
     2r^2 - 2r + 1 = 4
     \]
     \[
     2r^2 - 2r - 3 = 0
     \]
     \[
     r^2 - r - \frac{3}{2} = 0
     \]
     Solving this quadratic equation:
     \[
     r = \frac{1 \pm \sqrt{1 + 6}}{2} = \frac{1 \pm \sqrt{7}}{2}
     \]
     Since \(r\) must be positive:
     \[
     r = \frac{1 + \sqrt{7}}{2}
     \]
   - The area of \(ABCD\) remains the same as it is still a rhombus with side length \(2\):
     \[
     \text{Area} = 2 \times 2 = 4
     \]

Conclusion:
The possible values of the area of the quadrilateral \(ABCD\) are \(3\) and \(4\).

The final answer is \( \boxed{ 3, 4 } \).