Engineering Board Exam Reviewer · Ellipses · medium

The major axis of an ellipse is twice its minor axis. Find the eccentricity.

1. 1/2
2. sqrt(2)2 0.707
3. sqrt(3)2 0.866
4. 3/4

Answer

C. sqrt(3)2 0.866

Solution

a=2b, so e=sqrt(1-b2/a2)=sqrt(1- 14)= 3/2 0.866.

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