Big Ideas Math Geometry, 2014
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Big Ideas Math Geometry, 2014 View details
3. Proofs with Parallel Lines
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Exercise 41 Page 144

Use the Distance Formula.

about 6.71

Practice makes perfect
To determine the distance between two points, we use the Distance Formula. The coordinates of the given points are (1,3) and (- 2,9).
d = sqrt((x_2-x_1)^2 + (y_2-y_1)^2)
d=sqrt(( - 2- 1)^2+( 9- 3)^2)
d=sqrt((- 3)^2+6^2)
d=sqrt(9+36)
d=sqrt(45)
d≈ 6.71
The distance between the given points is about 6.71.