subtend

The line with letters that subtend 5 minutes of an arc from 20 feet represents the smallest letters that a person with normal acuity should be able to read at that distance.

From Textbooks ● Jun. 19, 2013

The condition of resolution of a double line whose components subtend an angle θ is that θ must exceed λ/a.

From Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 4 "Diameter" to "Dinarchus" by Various

We conclude that a double line cannot be fairly resolved unless its components subtend an angle exceeding that subtended by the wave-length of light at a distance equal to the horizontal aperture.

From Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 4 "Diameter" to "Dinarchus" by Various

It is obvious that these astrological hours will be of unequal length, as equal portions of the ecliptic subtend unequal angles at the pole of the equator.

From Notes and Queries, Number 69, February 22, 1851 A Medium of Inter-communication for Literary Men, Artists, Antiquaries, Genealogists, etc. by George Bell

For the side of the equilaterall triangle doth subtend 1/3 of the whole pheriphery.

From The Way To Geometry by William Bedwell