From the image, it looks like a right triangle with two legs labeled 3 and 4, and the hypotenuse labeled $c$. To find the value of $c$, we can apply the Pythagorean theorem:

$c = \sqrt{a^2 + b^2}$

Substituting $a = 3$ and $b = 4$:

$c = \sqrt{3^2 + 4^2} = \sqrt{9 + 16} = \sqrt{25} = 5$

The value of $c$ is $5$.

Would you like more details or have any questions?

Here are 5 related questions:

1. What is the Pythagorean theorem, and when is it used?
2. Can the Pythagorean theorem be used for non-right triangles?
3. How do we know which side is the hypotenuse in a right triangle?
4. How can we calculate the area of a right triangle given two sides?
5. What happens if the triangle sides are given as decimals or fractions?

Tip: Always ensure that you're applying the Pythagorean theorem to right-angled triangles only.