A right-angled triangle DEF DEF\,DEF is shown. The right angle is located at vertex EEE. Vertex D D\,D is above EEE, and vertex F F\,F is to the right of EEE. The angle at vertex F F\,F is 55∘55^\circ55∘. The length of the base EF EF\,EF is 12 mm.
Calculate the length of DEDEDE. Give your answer correct to 1 decimal place.
