It depends on which shape the Banquet Hall is, but most are rectangular, so you would just measure the length of the room and multiply it by the width of the room.
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To cover a hall of 25mx25m is 625 sq m As area of hall is calculated by length x breadth which is nothing but same length is there it is nothing but a square
It is 143 square metres, except that with those dimensions I'd call it a hall!
There is no standard size for a hall.
where is my centre for ssc board 2010, my hall ticket no. a223548
Perhaps you mean "Monty Hall" problem. If so, see the related question: What is the Monty Hall Paradox?