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Math Help - Needing help with these problems

  1. #1
    Newbie
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    Sep 2009
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    Needing help with these problems

    Hello,

    I need help with these problems please.

    I did the following, please check to ensure they are correct.

    Find the distance between A(-3,3) and B(-6,5) using the distance formula.

    d= (-6--3)2+(5-3)2

    d= (-6+3) 2+(5-3)2

    d= (-3)2+(2)2

    d= (9) +(4)

    d= 14 == 3.741



    I cannot figure out the following. If you can help in any way, please help.

    Find the distance between A (-4,2) and B (-6,4) using the Pythagorean Theorem. Use graph paper.

    Also

    Find the coordinates of the midpoint of segment QR having the endpoints:

    Q (-.4, 2.5) R (3.5, 1.5)

    Thank you,

    Siobhan
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  2. #2
    Member rtblue's Avatar
    Joined
    Mar 2009
    From
    Birmingham, Alabama.
    Posts
    221
    well, your distance equation is right.

    and to use the pythag. Theorm, you just draw a right triangle with those two points, and solve for the hypotenuse, because you have the 2 legs.

    The line that connects the two points is the hypotenuse. Then just make a right triangle with that.

    To find the midpoint, you take the average of the 2 x coordinates and the 2 y coordinates, and combine those 2 averages, to make 1 ordered pair.

    So:

    -0.4+3.5=3.1

    3.1/2=1.55

    So the X coordinate of the midpoint will be 1.55

    2.5+1.5=4

    4/2=2

    So the Y coordinate of the midpoint will be 2

    So the midpoint will be: (1.55,2)
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  3. #3
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    Thanks, you rawk!
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