Long description: Fig361a
Alt text: A diagram illustrating cross-sectional area measurements, showing dimensions labeled with 'h' and 'y' along the vertical axis and 'x' along the horizontal axis.
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- The image is a two-dimensional graph with the vertical axis labeled with 'y' and the horizontal axis labeled with 'x', indicating a coordinate system.
- A rectangular region is depicted, representing a cross-section with a total height labeled 'h' and a width that extends along the 'x' axis.
- Within this rectangular region, a shaded area labeled '\(\text{d}A\)' is shown, positioned at a vertical height indicated by the difference '\(\text{h} - \text{y}\)' from the top edge.
- A vertical dashed line segment shows the height '\(\text{y}\)' from the bottom edge to the center of the shaded area.
- A dashed diagonal line passes through the bottom-left corner of the visible rectangular structure, suggesting a surface or boundary within the illustrated volume.