Please help! Points A and B are the foci of a conic section. Two points on the conic section, C and D, have distances to the foci A and B as shown.
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CA=5
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CB=10
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DA=8
In order for the points C and D to be on the same ellipse, the distance would have to equal what?

Question

amistre64 · Answer

the "distance" of what?

anonymous · Answer

Thought we had this one already..

amistre64 · Answer

its like a recurrsion equation; just keeps coming back around to haunt you :)

anonymous · Answer

Oh, repost, nobody answered.

anonymous · Answer

:-)

amistre64 · Answer

the question is incomplete ....

anonymous · Answer

So, it's just any old conic section then....

amistre64 · Answer

"...be on the same ellipse..."

anonymous · Answer

Yes, I saw that after, thinking...

anonymous · Answer

I think he must be referring to the fact that u can create an ellipse with a piece of string and a couple drawing pins at the foci.

ie Ca +Cb = Da  +Db making Db = 3 (the missing distance).