Assertion: spheroid's ax | /r/HasProperty | principal
Facets:
Source sentences:
text: A spheroid is a quadric surface obtained by rotating an ellipse about one of its principal axes; in other words, an ellipsoid with two equal semi-diameters.
text: It is got by rotating an ellipse about one of its principal axes.
text: It is got by rotating an ellipse about one of its principal axes.
text: It is got by rotating an ellipse about one of its principal axes.