Imagine one eye. Take a flat, sharp, board and imagine slipping it through the middle of the eye. Now divide the eye right down the middle. The two halve you end up with are cross sections of the eye. You can orient your flat "board" or plane vertically, horizontally, or at any axis.
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You cannot create a cross sectional area of a rectangle. You can only create cross sectional areas for triangular shapes.
the larger the cross sectional area, the smaller the resistance
reduction ratio= initial cross sectional area/final cross sectional area
To calculate the cross-sectional area of a shape, you need to determine the shape of the cross-section first (e.g., square, circle, triangle). Then, use the appropriate formula for that shape. For example, the formula for the cross-sectional area of a square is side length squared, for a circle it is pi times the radius squared, and for a triangle it is base times height divided by 2. Finally, plug in the given dimensions into the formula to calculate the cross-sectional area.
Cross-sectional area = pi*radius2