#### $90\pi$ ç«æ¹ã¡ã¼ãã«, $78\pi$ å¹³æ¹ã¡ã¼ãã«

February 22, 2026

$#### $90\pi$ ç«æ¹ã¡ã¼ãã«, $78\pi$ å¹³æ¹ã¡ã¼ãã«$

→ 32000 → 16000 → 8000 → 4000 → 2000 → 1000 → 500 → 250 → 125 → 62.5? — not integer.
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ä½ç© $V$ ã¯æ¬¡ã®å¼ã§æ±ãããã¾ã:
ä¸å¿ã $(3, -2)$ ã§åå¾ã5ã®åãããã¾ããåã®æ¹ç¨å¼ãæ¸ãããã®åä¸ã®ç¹ $(6, 1)$ ãç¢ºèªãã¦ãã ããã
ä¸å¿ã $(h, k)$ ã§åå¾ã $r$ ã®åã®æ¹ç¨å¼ã¯æ¬¡ã®ã¨ããã§ã:
ä¸ããããä¸å¿ $(3, -2)$ ã¨åå¾ $5$ ãä»£å¥ãã¾ã: