Q&A for How to Find the Midpoint of a Line Segment

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  • Question
    How do I find the other end of the line segment if I'm given one end and the midpoint?
    Donagan
    Top Answerer
    The line segment extends beyond the midpoint a distance equal to the distance between the given end point and the midpoint. As a simple example, if the line segment begins at (0,0) and has a midpoint at (2,3), the line segment extends 2 x-units and 3 y-units beyond (2,3), meaning that the line segment ends at (4,6).
  • Question
    How do I find the point that is one forth of the way from (2,4) to (10,8)?
    Donagan
    Top Answerer
    Solve this by inspection: the point's x-coordinate is one-quarter of the way from 2 to 10, which is 4. The point's y-coordinate is one-quarter of the way from 4 to 8, which is 5. Thus, the point's coordinates are (4,5).
  • Question
    What is the midpoint of a line segment with endpoint at (0,8) and (-8,0)?
    Donagan
    Top Answerer
    As shown in the above article, the midpoint's x-coordinate is halfway between the x-coordinates of the endpoints, 0 and -8 (i.e., -4), and the midpoint's y-coordinate is halfway between the y-coordinates of the endpoints, 8 and 0 (i.e., 4) Thus, the midpoint is located at (-4,4).
  • Question
    What's the midpoint of (2,8) and (10,12)?
    Community Answer
    (X1 + X2) / 2 , (Y1 + Y2) / 2 Therefore, the midpoint is (6,10)
  • Question
    How do I find the coordinates of the point A (3,-4) and B (-2,5) that is twice as far from A as from B?
    Donagan
    Top Answerer
    First of all, there is an infinite number of points on the coordinate plane that satisfy that requirement. However, considering only points on the line that connects points A and B, the required point has an x-coordinate two-thirds of the way from 3 to -2 and a y-coordinate two-thirds of the way from -4 to 5. The x-distance from 3 to -2 is 5. 2/3 of 5 is 10/3 or 3 1/3. Add 3 1/3 to 3 (the x-coordinate of A) to get 6 1/3, which is the x-coordinate of the required point. The y-distance from -4 to 5 is 9. 2/3 of 9 is 6. Add 6 to -4 (the y-coordinate of A) to get 2, which is the y-coordinate of the required point. Thus, the required point is (6 1/3, 2).
  • Question
    If the coordinates of the midpoint of the line segment with end points (a, 4) and (3, b) are (5, -2), how do I find the values of a and b?
    Donagan
    Top Answerer
    5 is the midpoint between a and 3 on the x-axis, and -2 is the midpoint between 4 and b on the y-axis. As for the x coordinates, there is a distance of 2 units from midpoint 5 to end point 3, so you would count 2 units from 5 in the other x direction (to the left), meaning the value of a is 7. As for the y coordinates, there is a distance of 6 units from midpoint -2 to end point 4, so you would count 6 units from -2 in the other y direction (down), meaning the value of b is -8.
  • Question
    What is the midpoint of a segment whose end points are (5,8) and (11,6)?
    Community Answer
    Add x values and divide by 2. This will give you the x coordinate of the midpoint. Then do the same with the y values and get the y coordinate of the midpoint. The midpoint will be (8,7).
  • Question
    What is the complementary angle of 65?
    Donagan
    Top Answerer
    The complementary angle of 65° is 25°.
  • Question
    What is the slope of a line segment?
    Donagan
    Top Answerer
    The slope is a measurement of the vertical change of a line from one point to another, compared with (divided by) its horizontal change between the same two points.
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