Because AB=4, angle B=60 degrees, BE=2? AE=2* root number 3? EC=B`C= 1

Because angle B= angle B'? Angle b' = angle DCB'? So triangle ABB' is similar to triangle CB' f.

So the S triangle CB `f =1/2b`c *1/4ae = root number 3 divided by 4.

S triangle AEB`= 1/2AE*EB`=2* root number 3.

So s quadrilateral AFCE=2* root number 3? -? Three-fourths root number = seven-fourths * root number 3