Choosen As Best Answer

方法1:
兩條直線若相互垂直,則斜率相乘 = -1
方法2:
畢氏定理

方法1:
AB的斜率 = 2-8 / 9-(-4) = -6/13
BC的斜率 = t-2 / 3-9 = (2-t)/6
相乘 = -1 => (2-t)/6 = 13/6
=> t = -11 => C(3, -11)

方法2:
AB^2 + BC^2 = AC^2
13^2 + (-6)^2 + (-6)^2 + (t-2)^2 = 7^2 + (t-8)^2
169 + 36 + 36 + (t-2)^2 = 49 + (t-8)^2
12t = -132
t = -11 => C(3, -11)

鸆羿

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