Guest

why there is two focus in ellipse?and what it indicates?

why there is two focus in ellipse?and what it indicates?

Grade:11

2 Answers

AKASH GOYAL AskiitiansExpert-IITD
419 Points
11 years ago

Dear Baba

For an ellipse there are two foci so that the sum of the distances to the foci from any point on the ellipse is a constant.If we have one focus then it will convert into circle. In terms of the diagram shown below, with "x" marking the location of the foci, we have the equation:

a + b = constant

that defines the ellipse in terms of the distances a and b.

All the best.

AKASH GOYAL

AskiitiansExpert-IITD

 

Please feel free to post as many doubts on our discussion forum as you can. We are all IITians and here to help you in your IIT JEE preparation.

Win exciting gifts by answering the questions on Discussion Forum. So help discuss any query on askiitians forum and become an Elite Expert League askiitian.

Now you score 5+15 POINTS by uploading your Pic and Downloading the Askiitians Toolbar  respectively : Click here to download the toolbar..

vikas askiitian expert
509 Points
11 years ago

As an alternate definition of an ellipse, we begin with two fixed points in the plane. Now consider any point whose distances from these two points add up to a fixed constant d. The set of all such points is an ellipse. The two fixed points that were chosen at the start are called the foci of the ellipse; individually, each of these points is called a focus (pronounced in the usual way).

Think You Can Provide A Better Answer ?

Provide a better Answer & Earn Cool Goodies See our forum point policy

ASK QUESTION

Get your questions answered by the expert for free