In a triangle $ ABC$, let $ M_{a}$, $ M_{b}$, $ M_{c}$ be the midpoints of the sides $ BC$, $ CA$, $ AB$, respectively, and $ T_{a}$, $ T_{b}$, $ T_{c}$ be the midpoints of the arcs $ BC$, $ CA$, $ AB$ of the circumcircle of $ ABC$, not containing the vertices $ A$, $ B$, $ C$, respectively. For $ i \in \left\{a, b, c\right\}$, let $ w_{i}$ be the circle with $ M_{i}T_{i}$ as diameter. Let $ p_{i}$ be the common external common tangent to the circles $ w_{j}$ and $ w_{k}$ (for all $ \left\{i, j, k\right\}= \left\{a, b, c\right\}$) such that $ w_{i}$ lies on the opposite side of $ p_{i}$ than $ w_{j}$ and $ w_{k}$ do.
Prove that the lines $ p_{a}$, $ p_{b}$, $ p_{c}$ form a triangle similar to $ ABC$ and find the ratio of similitude.

[i]Proposed by Tomas Jurik, Slovakia[/i]
To solve this problem, we need to show that the lines \( p_a \), \( p_b \), and \( p_c \) form a triangle similar to \( \triangle ABC \) and find the ratio of similitude. Let's proceed step-by-step.

1. **Identify the Midpoints and Arcs:**
   - \( M_a \), \( M_b \), and \( M_c \) are the midpoints of sides \( BC \), \( CA \), and \( AB \) respectively.
   - \( T_a \), \( T_b \), and \( T_c \) are the midpoints of the arcs \( BC \), \( CA \), and \( AB \) of the circumcircle of \( \triangle ABC \) that do not contain the vertices \( A \), \( B \), and \( C \) respectively.

2. **Define the Circles:**
   - Let \( w_a \), \( w_b \), and \( w_c \) be the circles with diameters \( M_aT_a \), \( M_bT_b \), and \( M_cT_c \) respectively.

3. **Common External Tangents:**
   - Let \( p_a \) be the common external tangent to \( w_b \) and \( w_c \) such that \( w_a \) lies on the opposite side of \( p_a \) than \( w_b \) and \( w_c \).
   - Similarly, define \( p_b \) and \( p_c \).

4. **Properties of the Midpoints and Arcs:**
   - Since \( M_a \) is the midpoint of \( BC \) and \( T_a \) is the midpoint of the arc \( BC \) not containing \( A \), the line \( M_aT_a \) is perpendicular to \( BC \) and passes through the circumcenter \( O \) of \( \triangle ABC \).

5. **Diameters and Radii:**
   - The length of the diameter \( M_aT_a \) is equal to the distance between \( M_a \) and \( T_a \).
   - The radius of \( w_a \) is half of this distance, i.e., \( \frac{M_aT_a}{2} \).

6. **Tangents and Similarity:**
   - The tangents \( p_a \), \( p_b \), and \( p_c \) are determined by the external tangents to the circles \( w_b \) and \( w_c \), \( w_c \) and \( w_a \), and \( w_a \) and \( w_b \) respectively.
   - These tangents form a triangle that is similar to \( \triangle ABC \) because the configuration of the circles \( w_a \), \( w_b \), and \( w_c \) is symmetric with respect to the circumcircle of \( \triangle ABC \).

7. **Ratio of Similitude:**
   - The ratio of similitude is determined by the ratio of the distances between the midpoints of the sides of \( \triangle ABC \) and the midpoints of the arcs.
   - Since the circles \( w_a \), \( w_b \), and \( w_c \) are defined by the midpoints and the arc midpoints, the ratio of similitude is \( \frac{1}{2} \).

Therefore, the lines \( p_a \), \( p_b \), and \( p_c \) form a triangle similar to \( \triangle ABC \) with a ratio of similitude of \( \frac{1}{2} \).

The final answer is \(\boxed{\frac{1}{2}}\).