⌂ Ellipse Foci

Drag the point around the ellipse. The sum of distances to both foci (orange dots) always stays the same—this is the defining property of an ellipse!

d₁
0.00
+
d₂
0.00
=
Sum (constant)
2.00
Foci (F₁, F₂)
Point P
d₁
d₂