A half-circle or semicircle; a shape formed by cutting a circle exactly in half along a diameter.
From 'demi-' plus 'circle,' where 'circle' comes from Latin 'circulus.' This geometric term appeared in Middle English mathematical texts translated from Arabic and French sources.
The demicircle is one of geometry's most important shapes—you see it in arches, domes, and even the logos of companies today, proving that a shape the Romans used 2,000 years ago is still perfectly useful!
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