?url_ver=Z39.88-2004&rft_id=10.1007%2Fs10649-022-10191-z&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=Timothy+H.&rft.aulast=Lehmann&rft.au=Lehmann%2C+Timothy+H.&rft.title=Educational+Studies+in+Mathematics&rft.date=March+2023&rft.volume=112&rft.issue=3&rft.issn=0013-1954&rft.atitle=Learning+to+measure+the+area+of+composite+shapes&rft.genre=article