The first group was assigned to create a replica of a pink granite dome that rises into the air out of a relatively flat region of landscape. since the students know the rock formation is shaped like a dome, they decide to create (using clay) a replica model that has a circular base. the students learned that the dome-shaped rock formation covers a region of about 630 acres. assuming that this rock formation is circular in shape, what is the approximate diameter, in yards, of its base? use pi ≈ 22/7. note 1 acre = 4,840 yd2. (hint a = π r2.)