the elevation of the North Rim is 5389 ft and the elevation of the campground is 2045 ft. the mans range finder indicates that his line of sight distance to the campground is 3044 ft

The perimeter of △cde is 55 cm. a rhombus dmfn is inscribed in this triangle so that vertices m, f, and n lie on the sides cd , ce , and de respectively. find cd and de if cf=8 cm and ef=12 cm. the answer is not cd=20 and de=15. i have tried that one, it does not work.