Which lines are typically drawn at a 45-degree angle to show constructional details in an object?

Section lines are commonly used in technical drawings to indicate where a cut has been made through an object, providing a view of the internal features. These lines are typically drawn at a 45-degree angle to clearly differentiate them from other elements in the drawing. The angled lines help indicate the material type or the areas of the object being sectioned, which is essential for understanding the engineering or architectural details.

Each of the other options serves a distinct purpose. Cross-hatching lines are often used to fill areas and indicate different materials but do not specifically denote sectioned areas. Dimension lines provide information about the dimensions and measurements of the object but do not indicate constructional details. Construction lines are used as guides for drawing and aligning other features but are generally light and would not typically be highlighted in the same way as section lines. Thus, section lines are specifically designed to convey internal details and are recognizable by their 45-degree angle.