Q.

The length of the latus rectum of the parabola y2 =ax is              

A. 4a
B. a
C. a/4
D. 2a
Answer» B. a
Explanation: latus rectum is the line perpendicular to axis and passing through focus ends touching parabola. length of latus rectum of y2 =4ax, x2 =4ay is 4a; y2 =2ax, x2
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