Distance Measure using QGIS Field Calculator?

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A QGIS newbie who can't for the life of them work out the expression needed to represent distance from a point.

I want to show how a walkable a neighbourhood is. I need do to this by showing what areas are zoned residential and within 500m of parks and transport.

I have a map of a city and I want to show which areas are walkable (i.e close to parks and transport) both Parks and Transport land use has been identified show its just about showing which residential areas are within 500m of a park or transport.

I am following the second half of this tutorial (http://docs.aurin.org.au/tutorials-...-tutorials/geodesign-density-and-constraints/)

Almost every expression in geometry has given me an error!



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