Browse Questions

# The reflection of the point $(\alpha,\beta,\gamma)$ in the xy-plane is

$(A)\;(\alpha,\beta,0)\qquad(B)\;(0,0,\gamma)\qquad(C)(-\alpha,-\beta,\gamma)\qquad(D)\;(\alpha,\beta,-\gamma)$
Can you answer this question?

Toolbox:
• 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