11.22 Equation of the Tangent Plane to a Sphere11.23 Condition of Tangency11.24 Angle of Intersection of Two Spheres11.25 Condition of Orthogonality of Two Spheres11.26 Cylinder11.27 Equation of a Cylinder with given Axis and Guiding Curves11.28 Right Circular Cylinder11.29 Cone11.30 Equation of a Cone with Vertex at the Origin11.31 Equation of a Cone with Given Vertex and Guiding Curve11.32 Right Circular Cone11.33 Right Circular Cone with Vertex (α, β, γ), Semi Vertical Angle θ, and (l, m, n) the Direction Cosines of the Axis11.34 Conicoids11.35 Shape of an Ellipsoid11.36 Shape of the Hyperboloid of One Sheet11.37 Shape of the Hyperboloid of Two Sheets11.38 Shape of the Elliptic Cone11.39 Intersection of a Conicoid and a Line11.40 Tangent Plane at a Point of Central Conicoid11.41 Condition of Tangency11.42 Equation of Normal to the Central Conicoid at Any Point (α, β, γ) On ItExercises