1670а = ? га ? а

To convert an area from acres (a) to hectares (га), you can use the following conversion factor:

1 acre (a) = 0.404686 hectares (га)

Now, let's convert 1670 acres to hectares:

1670 a * 0.404686 га/a = 675.2382 га

Therefore, 1670 acres is equivalent to 675.2382 hectares.