...fame other plane. Fig, 22. -Let there be a cone, the vertex of which is the point; A, and the bafe the circle BC ; let it be cut by a plane through the axis, and let the fection be the triangle ABC ; let it be cut likewife by another plane, meeting both the fides, by which...

...axis, with this same plane. Let there be a cone (fig. 22.) the vertex of which is the point A, and the base the circle BC ; let it be cut by a plane through the axis, and let the section be the triangle ABC ; let it be cut likewise by another plane, meeting both the sides AB, AC,...

...any given straight line. Let there be a cone whose vertex is the point A and base the circle BF, and let it be cut by a plane through the axis, and let the section so made be the [axial] triangle ABF; now let it be cut by another plane cutting the circle...

...any given straight line. Let diere be a cone whose vertex is die point A and base die circle BF, and let it be cut by a plane through the axis, and let die section so made be die [axial] triangle ABF; now let it be cut by anodier plane cutting die circle...