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May 2nd, 2009, 04:27 PM   #11
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Re: please help...geometry

d1 = distance from point x0y0 to directrix
d2 = distance from pointx0y0 to focus



is this correct ????
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May 2nd, 2009, 06:53 PM   #12
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2. The formula was essentially okay, but had the numerator been negative you would use its absolute value.
3. You can rotate the axes by 45°, solve the resulting (easy) problem, then reverse the rotation. That isn't the only method, of course.
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May 3rd, 2009, 02:52 AM   #13
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Re:

Quote:
Originally Posted by skipjack
2. The formula was essentially okay, but had the numerator been negative you would use its absolute value.
3. You can rotate the axes by 45°, solve the resulting (easy) problem, then reverse the rotation. That isn't the only method, of course.
If I rotate axes by 45° directrix still is not parallel to one of axes ...
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May 3rd, 2009, 03:43 AM   #14
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What makes you think it wouldn't be parallel to one of the axes?
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May 3rd, 2009, 04:01 AM   #15
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Re: please help...geometry

sorry ... i made mistake in rotating axes ...
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May 3rd, 2009, 04:24 AM   #16
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Re: please help...geometry

ok i get something like this
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