In the figure given below,ABCD is a square.If BF=FE=ED=20cm,then find the area(in sq.cm) of the square

[Debashis]

 

[lex]

Make a start.
A good start is always to start labelling. Transfer the information from the question onto the picture.
Mark in the equal sides and lengths 20cm.
Mark in an angle e.g. FDE as '[MATH]x[/MATH]' (say).
Fill in all other angles (in terms of [MATH]x[/MATH]).
(This can all be done without knowing how you are going to tackle the problem.
Then you look at the picture and see if you can think of a way of proceeding).