The reflection of the point (α, β, γ) in the xy-plane is
A. (α, β, 0)
B. (0, 0, γ)
C. (-α, -β, -γ)
D. (α, β, -y)
Answer:D
The reflection of the point (α, β, γ) in the xy-plane is
A. (α, β, 0) B. (0, 0, γ) C. (-α, -β, -γ) D. (α, β, -y)