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In the trapezoidal footing formula, A1 and A2 represent the areas of the top and bottom sections of the trapezoid, respectively. To calculate A1, use the formula ( A1 = b1 \times h ), where ( b1 ) is the width of the top section and ( h ) is the height of the footing. For A2, use ( A2 = b2 \times h ), where ( b2 ) is the width of the bottom section. These areas are essential for determining the overall bearing capacity and load distribution of the footing.

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