Sagitta (geometry)

In geometry, the sagitta (sometimes abbreviated as sag^[1]) of a circular arc is the distance from the midpoint of the arc to the midpoint of its chord.^[2] It is used extensively in architecture when calculating the arc necessary to span a certain height and distance and also in optics where it is used to find the depth of a spherical mirror or lens. The name comes directly from Latin sagitta, meaning an "arrow".

^ Shaneyfelt, Ted V. "德博士的 Notes About Circles, ज्य, & कोज्य: What in the world is a hacovercosine?". Hilo, Hawaii: University of Hawaii. Archived from the original on 2015-09-19. Retrieved 2015-11-08.
^ Cite error: The named reference Woodward_1978 was invoked but never defined (see the help page).

[Shaneyfelt-1] Shaneyfelt, Ted V. "德博士的 Notes About Circles, ज्य, & कोज्य: What in the world is a hacovercosine?". Hilo, Hawaii: University of Hawaii. Archived from the original on 2015-09-19. Retrieved 2015-11-08.

[Woodward_1978-2] Cite error: The named reference Woodward_1978 was invoked but never defined (see the help page).

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