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Â ï § f y þ q Ü Ò æ y y y C £ æ ¢ Ô D å Ô µ æ æ { b a Ð L 8 Á w Ä G Þ Ô f à w » ë Ú ï ³ ã ï ¢ Í w Ú ï ³ ã ï £ w M ² ö o A ) f à t O b » ë Ú ï ³ ã ï w ý æ q t _ o M X { ® f b Æ z ¯ wP x v ¥ ì ( S#Ý>& >' Y  í1* p ²!111 Overview 1111 Sections of a cone Let l be a fixed vertical line and m be another line intersecting it at a fixed point V and inclined to it at an angle α (Fig 111) Fig 111 Suppose we rotate the line m around the line l in such a way that the angle α remains constant Then the surface generated is a doublenapped right circular hollow cone

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