First.. Find the side AB by pythagoras THEOREM.. That is 8cm..Area of ABCD= areaABC +areaBDCArea OD ABC =1/2x8x15=60cm SQUARE..Area of BDC by herons formula...semi perimeter, s =18 cmArea of BDC= 54cm squareSo area od ABCD= 54+60=114 cm square..Hope it helps..
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