$\"\"$

The two vector equations are $\"\"$ and $\"\"$ .

Find a unit vector normal to the plane.

Let $\"\"$ and $\"\"$ be two vectors in space, $\"\"$ is orthogonal to both $\"\"$ and $\"\"$ .

The normal vector is $\"\"$ .

$\"\"$

The normal vector is $\"\"$ .

$\"\"$

The unit vector of $\"\"$ is $\"\"$ .

The normal vector is $\"\"$ .

The magnitude of normal vector is $\"\"$ .

The unit vector of $\"\"$ is $\"\"$ .

The unit vector normal to the plane is $\"\"$ .

$\"\"$

The unit vector normal to the plane is $\"\"$ .