Félkörs

Félkörs is a Hungarian adjective describing something that has the shape of a semicircle or is related to a semicircle. The term derives from félkör, meaning semicircle, and is used in geometry, architecture, and design to indicate curved, half-circle forms.

In geometry, a semicircle is formed by taking one half of a circle cut by a diameter. If the radius is r, the area of the semicircular region is (pi r^2) / 2. The curved boundary has length pi r, and the straight boundary (the diameter) has length 2 r, so the total perimeter of the semicircular region is pi r + 2 r. A semicircle represents half of a full circle and is a common cross-sectional shape in various applications.

The term félkörs is frequently found in architectural and design contexts. It describes semicircular arches (félköríves boltív), niches, windows, or decorative elements that follow a half-circle profile. Semicircular forms are also used in furniture and industrial design to create curved silhouettes, while in engineering they may appear as semicircular cross-sections in pipes, channels, or culverts.

Usage and related terms: félkörs indicates a geometric or stylistic half-circle shape. It is often paired with more specific descriptors such as félköríves (semicircular-arched) or félkör keresztmetszet (semicircular cross-section). The concept is closely related to the broader study of circles, arcs, and curved geometry.

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