There can be no equivalence. A foot is a measure of length in 1-dimensional space while 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.
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1 ft = 30.48cm5.216 ft.
Almost 2 1/4 feet. There are 30.48 cm to 1 foot, so 68 cm = 68/30.48 ft = 2.23 ft
1024 GB = 1 TB.
1 mL = 0.001 L.
Because of the uniqueness of numbers, 1 billion is equal to exactly 1 billion: not more nor less.