The problem in the image seems to be related to geometry, possibly trigonometry or a theorem involving angles.

Here's the mathematical expression from the image:

• The given condition starts with "إذا كانت" (If it is given) and goes on to present the following relation: $\frac{أ}{ب} + \frac{ب}{ج} + \frac{ج}{د} = \frac{د}{ه}$ which translates to: $\frac{A}{B} + \frac{B}{C} + \frac{C}{D} = \frac{D}{E}$

The text mentions angles or relationships between them as part of solving a geometric problem.

To help you fully understand and solve the equation, could you clarify if this is part of a specific topic (e.g., similar triangles, angle properties, or a trigonometric identity)? This will allow me to provide a more detailed solution.

Would you like further clarification on this?

Here are 5 related questions:

1. Is this problem related to the properties of similar triangles or parallel lines?
2. Are the variables $A, B, C, D, E$ representing sides of a triangle or angles?
3. Is there any further context that ties this equation to specific angle theorems?
4. Would you like a review of solving systems of proportions in geometry?
5. Are you dealing with any specific angle properties or identities in this chapter?

Tip: When working with proportions or ratios in geometry, it's important to identify corresponding sides or angles in similar triangles or geometric figures.