Q34 of 62 Page 11

Find the coordinates of the foci, the vertices, the length of major axis, the minor axis, the eccentricity and the length of the latus rectum of the ellipse.
36x2 + 4y2 = 144.


The given equation of the ellipse can be written in standard form as.

= 1 or = 1

since the denominator of x2 < denominator of y2, the major axis is along the y-axis. Comparing the given equation with the standard equation

= 1

we have b = 2 and a = 6

Also, c = = = = 4

and e = = = =

Hence the foci, (0, c) and (0, c) are (0, 4) and (0, -4). Vertices, (0, a) and (0, a) are (0,6) and (0,-6); the length of the major axis, 2a is 12 units; the length of the minor axis, 2b is 4 units and the eccentricity of the ellipse, e is .

The length of latus rectum, is = units.

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