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中四數學 圓形

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請幫忙回答兩條關於圓的問題,謝謝。 *請列出步驟。 題目:https://drive.google.com/file/d/0B_CK4YeOZvSbOVZ5cjRRR2lIbUE/view?usp=sharing

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1)AM = AB/2 = 12/2 = 6 cm AM2 + OM2 = AO2 62 + OM2 = 102 OM = 8 cm CM = OC - OM = 10 - 8 = 2 cm 2)ON2 + CN2 = OC2 ON2 + (8/2)2 = OC2 ... ☆ OC = √(ON2 + 16) 另一方面, (ON + MN)2 + AM2 = OA2 (ON + 2)2 + (6/2)2 = OC2 , 代入 ☆ : (ON + 2)2 + (6/2)2 = ON2 + (8/2)2 (ON + 2)2 - ON2 = 16 - 9 2 (2ON + 2) = 7 ON + 1 = 7/4 ON = 3/4 cm 圖片參考:https://s.yimg.com/lo/api/res/1.2//YXBwaWQ9dHdhbnN3ZXJzO3E9ODU-/https://drive.google.com/viewerng/img?id=ACFrOgBs80Tmu4zPY2TJ8ihkW1GDv95uQlMZm4Q39WMXAIzGE7i3xl6tbyIqhhMixSEhJuPECjGdOKeDyp7OUyFMMaVblBE9WZ-wUa1jPwcYIQ4VYmh2kW_lDQtX8sw=&w=800&page=0

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