How to add footprint parameter into ODATA API query?

I just read FAQ about OData API:
https://scihub.copernicus.eu/twiki/do/view/SciHubUserGuide/ODataAPI

And now I am able to make such querry:

https://scihub.copernicus.eu/dhus/odata/v1/Products?$format=json&$filter=startswith(Name,'S2') and ContentDate/Start ge datetime'2018-08-25T00:00:00' and ContentDate/End le datetime'2018-08-26T00:00:00'

But I still don’t understand how to add footprint search parameter into this query.
Could you help me please?
Add any point and polygon parameters in my query example.