Assertion: ellipse's axis | /r/HasProperty | their arithmetic mean
Facets:
Source sentences:
text: Also, in terms of r a {\displaystyle r_{a}} and r p {\displaystyle r_{p}} , the semi-major axis a {\displaystyle a} is their arithmetic mean, the semi-minor axis b {\displaystyle b} is their geometric mean, and the semi-latus rectum ℓ {\displaystyle \ell } is their harmonic mean.