Assertion: ellipse's area | /r/HasProperty | πab
Facets:
Source sentences:
text: The area enclosed by an ellipse is πab, where (as before) a and b are one-half of the ellipse's major and minor axes respectively.
text: The area of an ellipse is πab =
text: The area enclosed by an ellipse is πab, where π is Archimedes' constant.