The area of the triangle shown is represented by A= s(8 - 9) (8 – 8) (8 - 5), where s is equal to half the perimeter. What is the height h of the triangle? Round your answer to the nearest hundredth.
8 ft
h
577
9 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.