To calculate the length of the sides labeled in the circles from the image, we need to use the information given and the properties of circles, triangles, and trigonometry. Since the image wasn't very clear, I'll describe how to calculate side lengths in a general case involving circles, assuming that the sides are chords or related to triangles inscribed in the circle.

General Steps:

1. Identify the Triangle: The triangles formed inside the circle could be right triangles, isosceles triangles, or any other type. Identify the type of triangle based on the problem statement or diagram.

2. Use the Pythagorean Theorem (if the triangle is a right triangle): If you have a right triangle, you can use: $a^2 + b^2 = c^2$ where $c$ is the hypotenuse, and $a$ and $b$ are the other two sides.

3. Use the Law of Cosines: For any triangle (not just right triangles) inscribed in a circle, the law of cosines can help: $c^2 = a^2 + b^2 - 2ab \cdot \cos(\theta)$ where $c$ is the side opposite the angle $\theta$, and $a$ and $b$ are the other two sides.

4. Consider the Circle’s Radius: If a triangle is inscribed in a circle, the length of a side of the triangle can also be related to the circle’s radius $r$. For example, in a right triangle inscribed in a circle, the hypotenuse is equal to the diameter of the circle.

Specific Cases (Based on common diagram types):

1. Right Triangle in a Semicircle: If the triangle is a right triangle inscribed in a semicircle, the hypotenuse is the diameter, $d = 2r$.

2. Isosceles Triangle in a Circle: If the triangle is isosceles and inscribed in the circle, and if you know the angle subtended by the base at the center, you can use trigonometry to find the base and other sides.

3. Chord Length: The length of a chord can be calculated using: $\text{Chord length} = 2r \sin\left(\frac{\theta}{2}\right)$ where $\theta$ is the central angle subtended by the chord.

If you can provide the specific information or clarify the diagram more, I can give you the exact method or calculation for your specific problem.

Would you like to explore one of these methods in detail, or do you have any specific values or angles given that I should consider?

Here are some related questions you might find useful:

1. How can the radius of the circle be used to find the side lengths of inscribed triangles?
2. What is the relationship between a chord and the central angle in a circle?
3. How does the Law of Sines apply to triangles in a circle?
4. How do you calculate the diameter of a circle if you know the length of a chord?
5. How can you find the length of an arc in a circle?
6. What properties do cyclic quadrilaterals have?
7. How do you use trigonometric ratios to find side lengths in non-right triangles?
8. What are the special properties of triangles inscribed in circles?

Tip: Remember that knowing the radius of the circle can significantly simplify the process of finding side lengths, especially when using trigonometric identities.