Jisho

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Noun, No-adjective
1. fan shape
Wikipedia definition
2. Circular sectorA circular sector or circle sector, is the portion of a disk enclosed by two radii and an arc, where the smaller area is known as the minor sector and the larger being the major sector. In the diagram, θ is the central angle in radians, the radius of the circle, and is the arc length of the minor sector. A sector with the central angle of 180° is called a semicircle.
Read “Circular sector” on English Wikipedia
Read “扇形” on Japanese Wikipedia
Read “Circular sector” on DBpedia
Other forms
扇形 【せんけい】

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