?url_ver=Z39.88-2004&rft_id=10.1080%2F14794802.2024.2304329&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Lehmann%2C+Timothy&rft.aulast=Lehmann&rft.aufirst=Timothy&rft.issn=1479-4802&rft.atitle=Learning+to+measure+the+area+of+circles&rft.title=Research+in+Mathematics+Education&rft.date=31+January+2024&rft.genre=article