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To find the measure of angle \( \angle F \) in the given diagram, we can apply geometric properties, especially noting that the angle at \( HGF \) is a straight line, which sums to 180 degrees.

### Step-by-step process:

1. The angle \( \angle HGF \) is part of a straight line, meaning \( \angle HGF + \angle EGF = 180^\circ \).
   - Given \( \angle HGF = 58^\circ \), we can set up the equation:
   \[
   58^\circ + \angle EGF = 180^\circ
   \]
   - Solving for \( \angle EGF \):
   \[
   \angle EGF = 180^\circ - 58^\circ = 122^\circ
   \]

2. In triangle \( EGF \), the sum of interior angles must equal 180 degrees:
   \[
   \angle EGF + \angle EFG + \angle FEG = 180^\circ
   \]
   - We know \( \angle EGF = 122^\circ \) and \( \angle EFG = x^\circ \). Since the diagram shows that \( \angle FEG = x^\circ \) (marked as equal), we have:
   \[
   122^\circ + x^\circ + x^\circ = 180^\circ
   \]
   - Simplifying this:
   \[
   122^\circ + 2x = 180^\circ
   \]
   - Solving for \( x \):
   \[
   2x = 180^\circ - 122^\circ = 58^\circ
   \]
   \[
   x = \frac{58^\circ}{2} = 29^\circ
   \]

Thus, the measure of \( \angle F \) is \( 29^\circ \).

Would you like further details or clarification on any part of the solution?

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Here are 5 related questions for further exploration:

1. What is the sum of the interior angles in a triangle, and why is this rule universal?
2. How would you find the unknown angles in a triangle if given different sets of information (e.g., two angles or one angle and two sides)?
3. Can you apply the same process to find angles in other polygons, such as quadrilaterals?
4. What is the difference between alternate interior angles and corresponding angles in a diagram involving parallel lines?
5. How does the exterior angle theorem apply to this problem, if at all?

**Tip:** In any triangle, the sum of the angles will always be 180°. Knowing two angles immediately allows you to calculate the third!

Find the measure of ∠F in the given triangle diagram.

This problem demonstrates how to find the measure of angle F in a triangle using basic geometric properties and angle relationships. It is suitable for students in Grades 7-9.

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