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The image you've uploaded contains a mathematical problem in Russian. The problem asks to solve for the area of triangle \(ABC\), given that points \(M\) and \(N\) are midpoints of the sides \(AB\) and \(BC\) respectively. The task involves finding the area of triangle \(MBN\).

Let’s break it down:

- **Triangle ABC**: You are given triangle \(ABC\).
- **Midpoints**: \(M\) and \(N\) are the midpoints of sides \(AB\) and \(BC\) respectively.
- **Area of Triangle MBN**: The goal is to find the area of triangle \(MBN\).

From the problem setup:
- Points \(M\) and \(N\) divide the triangle into smaller triangles, each of which has a relationship with the area of the larger triangle.
- Since \(M\) and \(N\) are midpoints, triangle \(MBN\) is similar to triangle \(ABC\), with a reduced area.

To find the area of triangle \(MBN\):
- The ratio of the area of triangle \(MBN\) to triangle \(ABC\) is \(\frac{1}{4}\), because when you draw lines connecting the midpoints, you form four smaller triangles of equal area.

If the area of triangle \(ABC\) is given as \(S\), the area of triangle \(MBN\) will be:

\[
\text{Area of } MBN = \frac{1}{4} \times \text{Area of } ABC
\]

If you can provide the area of triangle \(ABC\), I can calculate the exact area of triangle \(MBN\).

Let me know if you need further clarification or assistance! Would you like me to assist with additional related questions?

### Related Questions:
1. How is the area of a triangle calculated using its vertices' coordinates?
2. Can we use properties of midpoints to solve other geometric problems?
3. What other geometric shapes can be divided into smaller shapes with known area relationships?
4. What is the significance of midpoints in triangle geometry?
5. How does similarity between triangles affect their area ratios?

**Tip**: Always check if points are midpoints to take advantage of geometric properties like similarity and proportionality!

Solve the geometry problem involving midpoints of a triangle. Learn how to use the midpoint theorem and similarity of triangles to find the area of a smaller triangle within a larger triangle. Suitable for students in Grades 7-9.

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