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The task is to determine the length of the vector \(\vec{m}\) based on the given image. To find the length of the vector \(\vec{m}\), we need to calculate the magnitude using the Pythagorean theorem.

From the grid, the coordinates of the vector \(\vec{m}\) appear to be:

- Start point: \( (0, 0) \)
- End point: \( (2, \, 1) \)

The length (magnitude) of the vector \(\vec{m}\) is calculated using the formula:

\[
|\vec{m}| = \sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2}
\]

Substituting the coordinates:

\[
|\vec{m}| = \sqrt{(2 - 0)^2 + (1 - 0)^2} = \sqrt{4 + 1} = \sqrt{5}
\]

Since \(\sqrt{5}\) is not among the given options, it seems the correct answer is not explicitly listed. However, the closest estimate given the available options is:

1. \(4\)
2. \(\sqrt{3}\)
3. \(\sqrt{7}\)
4. \(5\)

The closest estimate numerically would be approximately \(\sqrt{5} \approx 2.24\), none perfectly match, but \(\sqrt{7} \approx 2.65\). It’s closest mathematically to \( \sqrt{5} \). 

Do you need further clarifications?

Here are relative questions:
1. What method can confirm accuracy of vector length visually?
2. Could additional transformations be applied to alter measurement outcomes?
3. When should coordinates be recalculated?
4. What scenarios involve exact choices diverging between options?
5. If uncertainty, what method aids approximation confirmation?
   
**Tip:** Always double-check grid alignment to ensure point readings match accurately defined coordinates.

Pēc zīmējuma noteikt vektora \( \vec{m} \) garumu.

Learn how to determine the magnitude of a vector using the Pythagorean theorem. This problem demonstrates key geometric concepts with vector coordinates and how to apply the magnitude formula. Suitable for students in Grades 8-10.

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