円錐を平面で切る
平行 → 放物線
平行 → 放物線円錐に内接する球を考える
円錐と平面の交線上の点
球と平面の接点 円錐と平面の交線上の点
頂点と結ぶ直線
球と平面の接点
球と円錐の接点
焦点
準線
放物線
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