The width of a rectangle is fifteen feet less than the length . if the area of the rectangle is 54 square feet , find the width . a. 3 ft
b. 6ft
c. 9 ft
d. 18 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.