What 21600 m in hectares?

Answer 1

A hectare is a measure of AREA whereas a metre is a measure of LENGTH. There is NO direct conversion between the two.

A linear measurement has 1 dimension; an area has 2 dimensions.

A line can be considered to have a 0 second dimension (zero width)→the area of 21600 m is 21600 m × 0 m = 0 m² = 0 hectares;

or it can be considered to have an infinite second dimension (infinite width)→the area of 21600 m is 21600 m × ∞ m = ∞ m² = ∞ hectares

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If you meant 21600 SQUARE metres in hectares, then:

10000 sq m = 1 ha

→ 21600 sq m = 21600 ÷ 10000 ha = 2.16 ha

Answer 2

There can be no conversion. A metre is a measure of length in 1-dimensional space while a hectare is a measure of area in 2-dimensional space. The two measure different characteristics and, according to the most basic principles of dimensional analysis, any attempts at comparisons or conversions between the two are fundamentally flawed.