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# Core 4 vectors watch

1. Ok, I have points U, V and W
The line UV is perpendicular to a plane in which U lies.

How does the fact that tell me that W is in the plane ?

Thanks
2. It means that UVW is a right-angled triangle (with the right-angle at U). This means that UW is perpendicular to UV, so it lies in the plane (since UV is the normal to the plane).
3. (Original post by nuodai)
It means that UVW is a right-angled triangle (with the right-angle at U). This means that UW is perpendicular to UV, so it lies in the plane (since UV is the normal to the plane).
Ahh, yes, ok.
Thanks
4. If the equation is (WV)^2 = (WU)^2 + (UV)^2 then just think of it as pythagoras with (WV)^2 being the hypotenuse. I always find drawing a diagram for vectors can be useful, especially 'show that' style questions. Hope this helps

Edit: Basically what nuodai said..I'm too slow!

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Updated: April 10, 2011
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