NCERT Class XI Mathematics - Conic Sections - Solutions
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Question : 35
Total: 71
Solution:
Given equation of ellipse is 16 x 2 + y 2 = 16
i.e.,
+
= 1 ⇒
+
= 1
Clearly, 16 > 1
The equation of ellipse in standard form is
+
= 1
∴a 2 = 16 ⇒ a = 4 and b 2 = 1 ⇒ b = 1
We know that c =√ a 2 − b 2 ⇒ c = √ 16 − 1 = √ 15
∴ Coordinates of foci are (0, ±c)
i.e. (0, ±√ 15 )
Coordinates of vertices are (0, ± a) i.e. (0, ± 4).
Length of major axis = 2a = 2 × 4 = 8
Length of minor axis = 2b = 2 × 1 = 2
Eccentricity (e) =
=
Length of latus rectum =
=
=
i.e.,
Clearly, 16 > 1
The equation of ellipse in standard form is
∴
We know that c =
∴ Coordinates of foci are (0, ±c)
i.e. (0, ±
Coordinates of vertices are (0, ± a) i.e. (0, ± 4).
Length of major axis = 2a = 2 × 4 = 8
Length of minor axis = 2b = 2 × 1 = 2
Eccentricity (e) =
Length of latus rectum =
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