Volume (\( V = \frac{d}{6} (A_1 + 4A_m + A_2) \)):

Where:

• \( V \) is the volume, in cubic length (L³).
• \( d \) is the distance between end areas, in length (L).
• \( A_1 \) and \( A_2 \) are the end areas, in square length (L²).
• \( A_m \) is the middle area halfway between the end areas, in square length (L²).