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In the standard form of an ellipse, a squared equals 64. How long is the major axis?
AIt is 8 units long
BIt is 16 units long
CIt is 32 units long
DIt is 64 units long
Answer & Solution
Correct answer: B. It is 16 units long
1. Take the square root of a squared to get a, so a is 8.
2. The length of the major axis is 2a, twice that half-length.
3. Doubling 8 gives 16 units for the full major axis.
4. Answering 8 units gives only the distance from the center out to one vertex.
_Source: OpenStax College Algebra (CC BY 4.0), Ch 8 "Analytic Geometry", section 8.1 The Ellipse_
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