18. Using the distance formula, show that the given points are collinear.(i) (1, 1), (5, 2) and (9,
18. Using the distance formula, show that the given points are collinear. (i) (1, 1), (5, 2) and (9, 5) (ii) (6, 9), (0, 1) and (-6, -7) (iii) (-1,-1), (2, 3) and (8, 11) (iv) (-2, 5), (0, 1) and (2, -3).

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20. Show that the points A(3, 0), B(6, 4) and C(-1, 3) are the vertices of an isosceles right triang

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17. If the point (x, y) is equidistant from the points (a+b,b-a) and (a-b, a + b),prove that bx = ay

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23. Show that the points (-3, -3), (3, 3) and (- 3sqrt(3), 3sqrt(3)) are the vertices of an equilate

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