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標題:
一題maths唔識呀救命>>>>今晚11:59前要交牙救命-口-
發問:
1) In the figure, A(-1,5), B(-5,-2), C(k,-1) and D(7,6) are the vertices of a quadrilateral and BA//CD. (a) Find the coordinates of C. (b) Prove that AC parallel BD. 圖片參考：http://i524.photobucket.com/albums/cc324/orzxdxp/f2.jpg
最佳解答:
(a) Since AB is parallel to DC, slope of AB = slope of DC [ 5-(-2) ] / [ (-1)-(-5) ] = [ 6-(-1) ] / [ 7-k ] 7/4 = 7/(7-k) k = 3 (b) Slope of AD = [ 6-5 ] / [ 7-(-1) ] = 1/8 Slope of BC = [ (-1)-(-2) ] / [ 3-(-5) ] = 1/8 = Slope of AD So AD is parallel to BC.
一題maths唔識呀救命>>>>今晚11:59前要交牙救命-口-
發問:
1) In the figure, A(-1,5), B(-5,-2), C(k,-1) and D(7,6) are the vertices of a quadrilateral and BA//CD. (a) Find the coordinates of C. (b) Prove that AC parallel BD. 圖片參考：http://i524.photobucket.com/albums/cc324/orzxdxp/f2.jpg
最佳解答:
(a) Since AB is parallel to DC, slope of AB = slope of DC [ 5-(-2) ] / [ (-1)-(-5) ] = [ 6-(-1) ] / [ 7-k ] 7/4 = 7/(7-k) k = 3 (b) Slope of AD = [ 6-5 ] / [ 7-(-1) ] = 1/8 Slope of BC = [ (-1)-(-2) ] / [ 3-(-5) ] = 1/8 = Slope of AD So AD is parallel to BC.
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