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Home  >>  CBSE XII  >>  Math  >>  Three Dimensional Geometry
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The reflection of the point $(\alpha,\beta,\gamma)$ in the xy-plane is

\[(A)\;(\alpha,\beta,0)\qquad(B)\;(0,0,\gamma)\qquad(C)(-\alpha,-\beta,\gamma)\qquad(D)\;(\alpha,\beta,-\gamma)\]
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  • The reflexion of the points in the xy palne. here the sign of the z coordinate changes.
The given point is $(\alpha,\beta,-\gamma)$
The reflexion of the points in the xy palne. where the sign of the z coordinate changes.
Hence the reflexion of the point $(\alpha,\beta,\gamma)$ in the xy plane is $(\alpha,\beta,-\gamma)$
The correct option is $D$
answered Jun 12, 2013 by meena.p
 
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