Geometry Geometry Math Forum

 May 2nd, 2009, 04:27 PM #11 Newbie   Joined: Mar 2009 Posts: 16 Thanks: 0 Re: please help...geometry d1 = distance from point x0y0 to directrix d2 = distance from pointx0y0 to focus is this correct ????
 May 2nd, 2009, 06:53 PM #12 Global Moderator   Joined: Dec 2006 Posts: 20,966 Thanks: 2215 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.
May 3rd, 2009, 02:52 AM   #13
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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 ...

 May 3rd, 2009, 03:43 AM #14 Global Moderator   Joined: Dec 2006 Posts: 20,966 Thanks: 2215 What makes you think it wouldn't be parallel to one of the axes?
 May 3rd, 2009, 04:01 AM #15 Newbie   Joined: Mar 2009 Posts: 16 Thanks: 0 Re: please help...geometry sorry ... i made mistake in rotating axes ...
 May 3rd, 2009, 04:24 AM #16 Newbie   Joined: Mar 2009 Posts: 16 Thanks: 0 Re: please help...geometry ok i get something like this

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