Describe the surface rho = constant in the spherical coordinate system. for a positive constant c, the surface is a sphere with radius incorrect: your answer is incorrect. if c = 0, the surface is . if c < 0, the surface is . describe the surface θ = constant in the spherical coordinate system. the surface is a plane perpendicular to the . the intersection with this plane is . describe the surface ϕ = constant in the spherical coordinate system. if ϕ = 0, the surface is . if ϕ = π, the surface is . if ϕ π 2 , the surface is the cone z = α x2 + y2 + z2 , where α = cos(ϕ). if ϕ π 2 , the surface is the plane z = 0.