Bai_20_TLBG_Mat_cau_Phan_01

# Bai_20_TLBG_Mat_cau_Phan_01 - Kha hc Ton 12 Thy L B Trn...

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Khóa h c Toán 12 Th y Lê Bá Tr ần Phương M t c u Hocmai.vn Ngôi trườ ng chung c a h c trò Vi t T ổng đài tư vấ n: 1900 58-58-12 - Trang | 1 - A. Lý thuy ế t 1. Định nghĩa mặ t c u T p h ợp các điểm trong không gian cách điể m O c đị nh 1 kho ng b ằng R không đổi đượ c g i là m t c u tâm O bán kính R. Kí hi u S(O; R) ho c (S) 2. Các thu t ng * Cho S(O; R) và A là điể m tùy ý trong không gian + N ế u OA > R thì ta nói A n m ngoài m t c u S(O; R) + N ế u OA = R thì ta nói A n m trên m t c u S(O; R) + N ế u OA < R thì nói A n m phía trong m t c u S(O; R) * Cho S(O; R). - C; D là 2 điể m n ằm trên S(O; R) khi đó CD đượ c g i là 1 dây cung. - N ếu CD đi qua O thì CD đượ c g ọi là đườ ng kính c a m t c u. 3. Kh i c u M t c u S(O; R) và ph n bên trong c a m t c ầu đượ c g i là kh i c u (hình c u) tâm O bán kính R.

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