中一maths 一問

BC = 1.2 - (-5.2) = 6.4
Area ofABC
= AB * BC / 2
= 3.2 * AB

a) so AB = Area of ABC / 3.2

b) suppose AB =x from the answer of part A
two possible pairfs of coordinates of the point A are
(1.2 - x, 1), (1.2 + x, 1)

2007-04-19 16:40:29 補充：
sorry, part b should be (1.2, 1 - x), (1.2, 1 + x)please substitute the value for the area of triangle ABC for the concrete answer

2007-04-21 10:43:46 補充：
i typed wrongly before, the correct answer is in my supplementary part

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