félkörív
A félkörív is a Hungarian term that translates to "semicircle" in English. It refers to half of a circle, specifically the arc formed by cutting a circle with a diameter. A semicircle has a central angle of 180 degrees. The perimeter of a semicircle consists of the curved arc and the diameter that connects its two endpoints. The length of the arc of a semicircle is half the circumference of the full circle, which can be calculated as πr, where 'r' is the radius of the circle. The area of a semicircle is half the area of the full circle, calculated as (πr²)/2. Félkörívek appear in various geometric contexts and architectural designs. For example, they are often seen in arches, windows, and decorative elements. In mathematics, the properties of semicircles are studied within the broader field of geometry and trigonometry. The term can also be used more generally to describe any arc that spans half a circle, regardless of its size or context.