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Mathematics 20 Online
OpenStudy (anonymous):

help me with some geometry questions please ?

OpenStudy (anonymous):

find the length of AB if A is located at (-5,0) and B is located at (1,0)

OpenStudy (anonymous):

|dw:1400450811568:dw|

OpenStudy (anonymous):

How would you find the length of that?

OpenStudy (anonymous):

We see that the y components do not matter since they are both 0 so using the x component of both the Points A and B you can solve for the length of the line they create

OpenStudy (anonymous):

would it be -4 ?

OpenStudy (anonymous):

@Johnbc

OpenStudy (anonymous):

Well if you were to add them up yes but we are not adding them up as they are because that would give us only the sum of the 2 points when we want the total distance

OpenStudy (anonymous):

Think of them both as positive numbers and add them up

OpenStudy (anonymous):

since we do not want negative numbers in our total distance

OpenStudy (anonymous):

so 6 ?

OpenStudy (anonymous):

Correct! its length is 6 units

OpenStudy (anonymous):

if we want to be consistent and it is less intuitive we can use the formula for distance between 2 points. Distance Formula: Given the two points (x1, y1) and (x2, y2), the distance between these points is given by the formula: \[d = \sqrt{(x_2-x_1)^2+(y_2-y_1)^2}\]

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