# Show that four points lie on a plane

## Homework Statement

(2; 0; 1); (-1; 2; 3); (3; 2; 2) and (3;-6;-3)

PS→⋅(PR→×PQ→)=0

## The Attempt at a Solution

Hi all, I am just wondering if my calculations are correct, and in fact these points do not lie on a plane. My answer is = 50 and i am not confident. Can anyone help me please?

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## Answers and Replies

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Orodruin
Staff Emeritus
Homework Helper
Gold Member
It would be much easier to judge if what you are doing is correct if you actually showed us what you are doing.

Edit: Also, the points do lie in a plane - any solution not resulting in this is going to be wrong.

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ehild
Homework Helper
Hi all, I am just wondering if my calculations are correct, and in fact these points do not lie on a plane. My answer is = 50 and i am not confident. Can anyone help me please?
What is 50?

ehild

I have miss-read the question. All it is asking me to do, is prove that these points lie in the same plane. May i ask how?

Orodruin
Staff Emeritus
Homework Helper
Gold Member
If this is a homework problem or problem in a course you are taking there should be a description of how to determine this in your course literature. Have you tried applying that?

HallsofIvy