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Why is a decagon called a decagon?
Mathematics tends to use Greek words, or combination of words, to describe geometric shapes. Decagon is made up of two parts, based on Greek words: deca- (a transliteration of δέκα) which means...
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What is a decagon?
a plane closed figure with ten sides and ten angles. degree: a unit of measurement of an angle. diagonal of a polygon: a line segment connecting one vertex to another vertex, and not a side of the...
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Can a rectangle tesselate?
yes
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Can a heptagon tesselate?
No.
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Is a star a decagon?
That depends. What most people describe as a typical star has 5 points with 2 sides to each point, which would be 10 sides. In that case, yes, it would be a decagon.