This problem is really getting to me, and I don't know why... INfo: Pyramid, Side length = 300 ft, perpendicular height = 321 ft, and slant height = (work shown later) 1. Find the slant height. Round your answer to the nearest whole number. (slant height)^2 = (height)^2 + (.5(side))^2 = (321)^2 + (150)^2 (slant height)^2 = 125,541 slant height = 354 feet. Is that correct? 2. Use your previous answer to find the area of the lateral face. (I'm not sure if I need to use height or slant height, but I used slant height, because when set straight, the slant height is perpendicular to the base. Please correct me if I'm wrong.) area = .5(base)(height) = .5(300)(354) = 53, 100. My main concern here is whether to use the slant height (354) or height (321) and why... Thanks for all the help.