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HSC 2015 MX2 Marathon (archive) (2 Viewers)

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VBN2470

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Re: HSC 2015 4U Marathon

NEW QUESTION (EASIER):

 

VBN2470

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Re: HSC 2015 4U Marathon

Yeah, better you try this at home with a clear mind, draw a diagram and try to see what the question actually means, I am not sure if your method of equating gradients ?? is actually correct, since the question at hand refers to angles other than that from the positive x-axis..
 

Ekman

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Re: HSC 2015 4U Marathon

NEXT QUESTION:

 

dan964

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Re: HSC 2015 4U Marathon

Since the diagonals of the rhombus are at 90 degrees
Possibly use the chord of contact is my guess that is of the form y=k or x=a.

Edit:
Find the vertices of the rhombus I would suggest.
To do this you need to find a tangent from (x1, y1) and by symmetry (-x1, y1)
 
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Drsoccerball

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Re: HSC 2015 4U Marathon

Since the diagonals of the rhombus are at 90 degrees
Possibly use the chord of contact is my guess that is of the form y=0.
Find the vertices of the rhombus I would suggest.
Whats the chord of contact..
 

Ekman

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Re: HSC 2015 4U Marathon

Don't be afraid to use parametric to solve it, however I suggest using Cartesian coordinates since it makes everything a lot more quicker.
 
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