Semicircle
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A semicircle of radius r.
In geometry, a semicircle is a two-dimensional geometric shape that forms half of a circle. Being half of a circle's 360° (360 degrees), the arc of a semicircle always measures 180°. A triangle inscribed in a semicircle is always a right triangle.
Semicircle Media
Construction of a square with the same area as a given oblong
- Comparison Ford circles Farey diagram.svg
Comparison of Ford circles and a Farey diagram with semicircles for n from 1 to 9. Each semicircle intersects its corresponding circles at right angles. In [ the SVG image,] hover over a circle or curve to highlight it and its terms.
- Arbelos.svg
An arbelos (grey region)