What is the length of the line segment AB with A(2,7) and B(-3,-12)?

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justaguide's profile pic

justaguide | College Teacher | (Level 2) Distinguished Educator

Posted on

The length of the line segment joining the points (x1, y1) and (x2, y2) is given by sqrt[(x1 - x2)^2 + (y1 - y2)^2]

substituting the values of x and y from the points A(2, 7) and B(-3 , -12) we get:

L = sqrt [( 2 + 3)^2 + (7 + 12)^2]

=> sqrt [ 5^2 + 19^2]

=> sqrt [ 25 + 361]

=> sqrt [ 386]

The required length of the line segment AB is sqrt 386

hala718's profile pic

hala718 | High School Teacher | (Level 1) Educator Emeritus

Posted on

Given the line segment AB such that A(2,7) and B(-3,-12)

We need to find the length of the line AB.

Then, we will use the distance between two points formula to find the length.

We know that:

D = sqrt( x2-x1)^2 + (y2-y1)^2

==> l AB l = sqrt[ (-3-2)^2 + (-12-7)^2 ]

                 = sqrt[ (25 + 361)

                 = sqrt(386) = 19.65

Then, the length of the line segment AB is 19.65 units ( approx.)

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