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The image shows a diagram with two straight lines intersected by a transversal, and you are asked to find the size of angle \( h \). The two known angles provided are \( 24^\circ \) and \( 53^\circ \).

### Solution:
- The two lines in the diagram are parallel because of the arrow symbols.
- The angle \( 24^\circ \) is an exterior angle, and angle \( h \) forms a straight line with it, making them **supplementary angles**. This means their sum is \( 180^\circ \).
  
Thus:
\[
h + 24^\circ = 180^\circ
\]

Solving for \( h \):
\[
h = 180^\circ - 24^\circ = 156^\circ
\]

Thus, the size of angle \( h \) is \( 156^\circ \).

### Do you want further details or have any questions? 
Here are five related questions to expand on this:
1. How can we identify supplementary and complementary angles in other cases?
2. What are the properties of parallel lines intersected by a transversal?
3. How do we solve for angles when two parallel lines are intersected by multiple transversals?
4. How can alternate interior angles help us solve angle-related problems in parallel lines?
5. What is the sum of angles on a straight line, and why does this property hold?

**Tip:** Always remember that angles on a straight line add up to \( 180^\circ \), and this can help solve many geometry problems involving parallel lines.

This problem involves finding the size of angle h in a diagram with parallel lines intersected by a transversal. Using the properties of supplementary angles and angles on a straight line, we determine that h is 156°. This solution is suitable for students in Grades 6-8.

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