decagon
6.7
A flat shape with ten straight sides and ten angles
- noun
- /ˈdɛkəˌɡɒn/
- Specialized
:
decágono
- A decagon has ten sides, which makes it a unique shape in geometry.
Examples
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The architect designed a park with a decagon playground for children to enjoy.
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In my art class, we created a model of a decagon using colorful paper.
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You have things with octagons and decagons and things like this and fitted together which make nice patterns.
How Many Sides
Surface Forms
Morphology
decagon = deca + gon (semi-transparent) = deca + gon
Formed from classical combining forms 'deca-' (ten) + '-gon' (angle); learners familiar with these morphemes can infer the meaning, but many B1 learners may not recognise the combining forms.
Etymology
Decagon comes from Greek parts deca- meaning 'ten' and -gon meaning 'angle'. So a decagon is a shape with ten angles and ten sides, and you can remember it like decade or decimal, which also mean 'ten'.