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Area of ​​the quadrant minus two semicircles

ÀÛ¼ºÀÚ Uploader : ¸·´ë»çÅÁ ÀÛ¼ºÀÏ Upload Date: 2019-08-23º¯°æÀÏ Update Date: 2019-09-04Á¶È¸¼ö View : 293

Find the area S of the remaining portion of the quadrant with radius R except for the two semicircles.

Quadrant area is :

S4 = (1/4)*¥ð*R^2

Since we need to subtract two triangles and two internal quadrants, as shown in the dotted line, S is :

S = S4 - 2*(1/2)*(R/2)^2 - (1/2)*(1/4)*¥ð*R^2
 = (1/4)*¥ð*R^2 - (1/4)*R^2 - (1/2)*(1/4)*¥ð*R^2
 = (1/4)*(¥ð - 1 - (1/2)*¥ð)*R^2
 = (1/4)*(¥ð/2 - 1)*R^2

*** Âü°í¹®Çå[References] ***

S = (1/4)*(¥ð/2 - 1)*R^2
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