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¿øÀÇ ¹æÁ¤½Ä x^2 + y^2 = r^2·Î ºÎÅÍ
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1»çºÐ¸éÀÇ ¿øÈ£ ½ÄÀº
y = (r^2 - x^2)^(1/2)

À̸¦ ȸÀü½ÃŲ ¸éÀÇ ¸éÀûÀº
¥ðy^2 = ¥ð(r^2 - x^2)

À̸¦ 0ºÎÅÍ r±îÁö ÀûºÐÇϸé(¹Ý±¸ÀÇ Ã¼Àû)
¥ð(r^3 - (1/3)r^2) = (2/3)¥ðr^3

µû¶ó¼­ ±¸ÀÇ Ã¼Àû V = (4/3)¥ðr^3

*** Âü°í¹®Çå[References] ***

V = 4/3 * ¥ð*r^3
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