Pearson Geometry Common Core, 2011
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Pearson Geometry Common Core, 2011 View details
7. Midpoint and Distance in the Coordinate Plane
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Exercise 3 Page 53

Use the Distance Formula.

≈ 8.5 units

Practice makes perfect
To determine the distance between two points, we use the Distance Formula. The coordinates of the given points are K(-9,8) and L(-6,0).
AB = sqrt((x_2-x_1)^2 + (y_2-y_1)^2)
AB = sqrt(( -9 - ( -6))^2 + ( 8- 0)^2)
AB = sqrt((-9 + 6)^2 + (8-0)^2)
AB = sqrt((-3)^2 + (8)^2)
AB = sqrt(9+64)
AB=sqrt(73)
AB=8.544003...
AB≈ 8.5
The distance between A and B is approximately 8.5 units.