Prove that every line normal to the cone with equation z=sqrt(x^2+y^2) intersects the z-axis.

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- Oct 10th 2010, 07:17 AMesum0209Prove
Prove that every line normal to the cone with equation z=sqrt(x^2+y^2) intersects the z-axis.

- Oct 10th 2010, 09:01 AMtonio
- Oct 10th 2010, 10:48 AMesum0209
- Oct 10th 2010, 11:28 AMPlato
What happens if

- Oct 10th 2010, 11:28 AMtonio