Architecture
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Area of circular sector, using radian

ÀÛ¼ºÀÚ Uploader : math1 ÀÛ¼ºÀÏ Upload Date: 2016-03-21º¯°æÀÏ Update Date: 2016-03-21Á¶È¸¼ö View : 472

The total area of a circle is ¥ðr^2. The area of the sector can be obtained by multiplying the circle's area by the ratio of the angle and 2¥ð. (because the area of the sector is proportional to its angle, and 2¥ð is the angle for the whole circle, in radians)

A = (¥ðr^2)(¥è/(2¥ð)) = (r^2 *¥è)/2  

r : radius of circle
¥è : central angle (radians)



*** Âü°í¹®Çå[References] ***

https://en.wikipedia.org/wiki/Circular_sector
https://upload.wikimedia.org/wikipedia/commons/d/da/Circle_arc.svg
A = (r^2 *¥è)/2
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