Determine the height of a radio tower, which appears on a vertical photograph for the following conditions of flying height above the tower base H, distance on the photograph from principal point to tower base rd and distance from principal point to toer top rt
*(a) H = 2425 ft.; rb = 3.18 in.; rt = 3.34 in.
(b) H = 6600 ft.; rb =96.83 mm; rt = 98.07 mm.