EASA NAV(A)basic
Which model best represents the Earth's shape for navigation systems?
Answer
Ellipsoid
Explanation
**Ellipsoid** is the best of these choices because it accounts for the Earth's slightly flattened polar shape. A perfect sphere is a useful approximation but is less accurate; a flat plate and circular plane do not represent the Earth. **Key takeaway:** Navigation models approximate Earth as an ellipsoid.\n\n**Glossary:** **Ellipsoid**: a sphere-like shape with slightly different equatorial and polar dimensions.
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