None, since there can be no conversion.
A foot is a measure of length in 1-dimensional space whereas a square foot 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.
810/30 = 27 feets
90 cm. there are 30 per foot
5.15 feets
three feets
Answer: 30 m² = 322.917 ft²
30
16 30 (if you count the squares of all sizes)
Two. 36, and 49 are perfect squares.
1 yard are 3 feets
10x10=100 ft
157 centimeters is 5.15 feet.