Circular segment - the part of the sector which remains after removing the triangle formed by the center of the circle and the two endpoints of the circular arc on the boundary.
Conic section
Hyperbolic sector
อ้างอิง
Gerard, L. J. V. The Elements of Geometry, in Eight Books; or, First Step in Applied Logic, London, Longman's Green, Reader & Dyer, 1874. p. 285
แหล่งข้อมูลอื่น
Definition and properties of a circle sector with interactive animation
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