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CONICOIDE. By Prof.Dharamvirsinh Parmar. Definition. The locus of the general equation of second degree in x, y, z is called a conicoid or quadric . . Ellipsoid. Properties. It is clear that centre of ellipsoid is (0, 0 0) Symmetrical with respect to three co – ordinate axis.
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CONICOIDE By Prof.DharamvirsinhParmar
Definition • The locus of the general equation of second degree in x, y, z is called a conicoid or quadric . DHARAMVIRSINH PARMAR
Ellipsoid DHARAMVIRSINH PARMAR
Properties • It is clear that centre of ellipsoid is (0, 0 0) • Symmetrical with respect to three co – ordinate axis. • Point of intersection with X – axis are (a,0,0) and (-a,0,0). • Similarly intersection with Y – axis, Z - axis are (0,±b,0) and (0,0, ±c) respectively. • For any point (x, y, z) on ellipsoid, -a ≤ x ≤ a, -b ≤ y ≤ b and –c ≤ z ≤ c. Ellipsoid is symmetrical surface. • The section of the surface by the plane z = k which are parallel to XOY plane are similar ellipses having equation DHARAMVIRSINH PARMAR
Properties • It is clear that centre of Hyperboloid of one sheet is (0, 0 0) • Symmetrical with respect to three co – ordinate axis. • Point of intersection with X – axis are (a,0,0) and (-a,0,0). • Similarly intersection with Y – axis are (0,±b,0). • It will not intersect to Z – axis, for that put x = 0, y = 0, we get z = - which is not possible • The section of the surface by the plane z = k which are parallel to XOY plane are similar ellipses having equation DHARAMVIRSINH PARMAR
Hyperboloid of two sheet DHARAMVIRSINH PARMAR
Properties • It is clear that centre of Hyperboloid of two sheet is (0, 0 0) • Symmetrical with respect to three co – ordinate axis. • Point of intersection with X – axis are (a,0,0) and (-a,0,0). • It will not intersect to Y-axis and Z – axis. • The section of the surface by the plane z = k which are parallel to XOY plane are similar hyperbolas having equation • The plane x = k, does not meet surface if • There is no portion of the surface between x = -a to x = a DHARAMVIRSINH PARMAR
Elliptic Paraboloid DHARAMVIRSINH PARMAR
Hyperbolic Paraboloid DHARAMVIRSINH PARMAR