Question

1. What is the image of point P(2, 3, 5) after a reflection about the xy-plane?
(Points : 1)
P´(2, 3, 5)

P´(2, 3, 5)

P´(2, 3, 5)

P´(2, 3, 5)

Answer 1

i dont know whether this will help but when u reflect along the x/y plane you interchange x and y to get your point eg. (x;y)--->>(y;x)

Answer 2

The answers are all the same?

Answer 3

reflection along a certain plane will keep those coordinates same and the invert the rest.

Just like in 2D if you reflect along Y -axis your (x,y) will be (-x,y)
Similarly if you reflect along x- axis (x,y) will be (x, -y)

So in 3D if you reflect along XY plane, your x and y coordinates remain the zame and your Z will get negated.

(x,y,z) reflected along xy plane will be (x,y,-z)