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<http://webisa.webdatacommons.org/401111507>	<http://www.w3.org/ns/prov#value>	"The students learn to estimate area, perimeter and irregular polygons using graph paper, geoboards, or other means." .
<http://webisa.webdatacommons.org/401111507>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<time4learning.com> .
<http://webisa.webdatacommons.org/prov/16970252>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/401111507> .