①円柱
底面の円の中心Ｂ、
半径ＢＡ＝4
高さＡＮ＝3
②円柱の上に乗る円錐
底面の円の中心…Ｎから下した垂線とＢＣの交点Ｐ
半径ＰＮ＝ＢＡ＝4
高さＰＣ＝ＮＤ＝1
③くり抜く円錐
底面の円の中心Ｂ
半径ＢＭ＝2
高さＢＣ＝4
後は解説の式通りに…
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