I was doing practising pure maths papers and I came across this plane questions and I don't know how a part is done and the marking scheme shows a method I don't understand so can u guys please help me understand part D of this questions. thanks alot in advanceAttachment 723756
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- Thread Starter
- 09-02-2018 08:18
- 09-02-2018 10:37
I can't comment on what's in the mark scheme as you haven't posted it, but the method I would suggest is:
* Let x be the displacement from P to Q in the direction parallel to AB
* Let y be the displacement from P to Q in the direction parallel to AD
* Let z be the height difference between P and Q
The directions of x, y and z are mutually at right angles.
Then PQ = SQRT(x^2 + y^2 + z^2)
This is Pythagoras in three dimensions.