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Problem Num : 1 Type: Mathematical Writing Section:Coordinate Geometry  Theme:None Adjustment# : 9 Difficulty: 800 level
Category	Distance
Analysis	r^2 + s^2 =u^2 + v^2 . How to show it?
Solution/Answer	r^2 + s^2 =u^2 + v^2 ? (1)It is not enough to show above equality. (2)r^2 + s^2 =(1-r)^2 + (1-s)^2 2(r+s)=2 r+s =1 so.. we need two condition to answer for the question. Answer: C

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