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Tardigrade
Question
Mathematics
The angle between the lines joining the foci of an ellipse to one particular extremity of the minor axis is 90° The eccentricity of the ellipse is
Q. The angle between the lines joining the foci of an ellipse to one particular extremity of the minor axis is
9
0
∘
The eccentricity of the ellipse is
1844
238
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A
8
1
B
3
1
C
3
2
D
2
1
Solution:
In
Δ
OS
A
,
t
an
4
π
=
b
a
e
⇒
1
=
b
a
e
⇒
e
2
=
a
2
b
2
∵
e
2
=
1
−
a
2
b
2
⇒
e
2
=
1
−
e
2
e
2
=
2
1
⇒
e
=
2
1