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Curated OER
Educational Technology Clearinghouse: Clip Art Etc: Encased Coin
The surrounding of the punchmark with a band bearing a name, and the introduction of a head in its center, gradually led to the perfect reverse. There is a remarkable series of so-called 'encased' coins struck in Magna Graecia, of which...
National Council of Teachers of Mathematics
The Math Forum: Plane Figure
This site provides a definition for plane figure (at the top of the page) and a few examples.
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