None, since there can be no conversion.
A linear (or lineal) metre is a measure of length in 1-dimensional space. A square metre is a measure of area in 2-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, any attempt at conversion from one to the other is fundamentally flawed.
81 square metres. 9 squared
9 square meters = 0.0022239484332 of an acre.
9
9ha = 90,000m²
9 square meters
9
54
9 square meters.
18 x 9 = 162 square meters
20.07 square meters.
Answer: 9 m² = 96.8751 ft²
9 of them.