What is the length of the major axis of the ellipse x^2/25 + y^2/9 = 1?
Answer and explanation
Correct answer: C. 10
- Step 1: a^2 = 25, so a = 5 and the major axis has length 2a = 10. Answer: 10. Why not the others: 5: That is the semi-major axis. 6: That is the minor axis. 25: That is a^2, not the length of the axis.
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