=1 pass through (0, 0) (0, 2) & (1, 0) Distance between F1&F2⇒α=2ae α2=4a2e2 Pass through (0, 0) ⇒
α2
4a2
+
β2
b2
=1
α2
4a2
=e2 Pass through (0, 2)
α2
4a2
+
(2−β)2
b2
=1 from these two ⇒ β=1 Use properties PF1+PF2=2a F1(0,1),F2(α,1),P(0,2) 1+√α+1=2a F1(0,1),F2(α,1),P(1,0) √1+1+√(α−1)2+1=2a From these two α=−2α+2√2a put α in any of above two equations a=