# Finding unit vectors perpendicular to this plane? ?

Which one and why did you find?

### 1 Answer

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- ted sLv 72 months ago
a x + b y + c z = 1 has < a , b , c > / √ ( a²+b²+c²) as a unit vector orthogonal to the plane

here you need to form 2 vectors A & B using the 3 points , then cross product them to find a , b , c

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