The answer will depend on the units used for 7.3 and 6. Are they metres, kilometres, millimetres? The question does not say and so it is impossible to give a sensible answer.
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Answer is 6. 72 is 36 x 2. Sqrt 36 is 6, so sqrt 72 is 6 x sqrt 2. Dividing this by sqrt 2 leaves 6.
72 square feet
1 foot = 12 inch 72" x 108 " = (72/12 ) feet x (108/12) feet = 6 feet x 9 feet = 54 square feet
1 meter bt 6 feet = 1 meter x (6x 0.3048) meter = 6 x0.3048 sq. meter = 1.8288 sq meter
10.81159128 square meter