The first of these is a particular case of the prismoidal formula (§ 58).
(iv) To find the volume of a prismoidal cutting with vertical ends, and with sides equally inclined to the vertical, so that 4 =0, let the value t of h, for the two ends be h, ?, and h2, 1k21 and write ml_ do 0 (a + h 1 cot 0), o 0 (a + hi cot 0), ot + h2 cot 0), n2 - o + cot B (a + h2 cot 0).
- FOr applications of the prismoidal formula, see Alfred Lodge, Mensuration for Senior Students (1895).
How would you define prismoidal? Add your definition here.