Q. 94.5( 32 Votes )

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Answer :

AB = BC = 3.5 cm and DE = 2cm


DC = DE + EC = 2 + 3.5 = 5.5 cm


As we know that,



Height of trapezium here, BC = 3.5 cm





AT = 15.75 sq.cm


Now, area of quarter circle = AQ




AQ = 9.625 sq.cm


Required area = AT – AQ


Req. area = 15.75 – 9.625 = 6.125 sq.cm


Area of remaining piece of cardboard is 6.125 sq.cm


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