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Question

The point P(4,5) divides AB internally in the ratio 1:1, where A(2,3) and B(x,y). What are the coordinates (x,y)?

The correct answer is

(6,7)

Dividing AB in the ratio 1:1 means P is the midpoint of AB.

Midpoint formula: \(P = \left(\frac{x_1 + x_2}{2}, \frac{y_1 + y_2}{2}\right)\)

For the x-coordinate: \(\frac{2 + x}{2} = 4 \Rightarrow 2 + x = 8 \Rightarrow x = 6\)

For the y-coordinate: \(\frac{3 + y}{2} = 5 \Rightarrow 3 + y = 10 \Rightarrow y = 7\)

So B = (6,7).

Hence, the answer is (6,7).

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Important Questions from Co-ordinate Geometry

  1. In which ratio the point (-3, p) divides the line segment joining the points (-5, -4) and (-2, 3)?

  2. In which quadrant both abscissa and ordinate are negative?

  3. Find the slope of the line joining the points (3, -4) and (5, 2).

  4. A1 (x1, y1), A2 (x2, y2), A3 (x3, y3) and A4 (x4, y4) are 4 points, p1 divides A1A2 in the ratio 1 ∶ 1, p2 divides P1A3 in the ratio 1 ∶ 2, P3 divides p2A4 in the ratio 1 ∶ 3. Then the coordinates of p3 are:

  5. The polar coordinates of the vertices of a triangle are (0, 0), \(\left( {3,\frac{\pi }{2}} \right)\) and \(\left( {3,\frac{\pi }{6}} \right)\). Then, the triangle is:

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