What is <radius> of <Earth> ?
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Which is the radius of Earth?
SELECT DISTINCT ?q WHERE { resource:Earth property:radius ?q }
select distinct ?answer where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q2> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P2120> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?answer. }
select distinct ?answer where { wd:Q2 wdt:P2120 ?answer}
6371 6356.8 6378.137