ABCD is a field in the shape of a trapezium. `A B||D C` and `/_A B C=90^0,` `/_D A B=60^0dot` Four sectors are formed with centres `A ,B ,Ca n dD` (See Figure). The radius of each sector is 17.6m. Find the total area of the four sectors. area of remaining portion given that `A B=75 ma n dC D=50 mdot`