Question

Find the constant sum for an ellipse with foci F1 (2, 0), F2 (-6, 0) and the point on the ellipse (2, 6). The constant sum is: ____. Enter only a number.

Answer 1

One property of an ellipse is that, from any point, the sum of the distances to the two foci is constant.

√((2- 2)² + (6 - 0)²) + √((2 - (-6))² + (6 - 0)²)
= √36 + √100
= 6 + 10
= 16

Answer 2

oh ok yes i understand thanks :)